/**
 * Twenty Fifteen functions and definitions
 *
 * Set up the theme and provides some helper functions, which are used in the
 * theme as custom template tags. Others are attached to action and filter
 * hooks in WordPress to change core functionality.
 *
 * When using a child theme you can override certain functions (those wrapped
 * in a function_exists() call) by defining them first in your child theme's
 * functions.php file. The child theme's functions.php file is included before
 * the parent theme's file, so the child theme functions would be used.
 *
 * @link https://developer.wordpress.org/themes/basics/theme-functions/
 * @link https://developer.wordpress.org/themes/advanced-topics/child-themes/
 *
 * Functions that are not pluggable (not wrapped in function_exists()) are
 * instead attached to a filter or action hook.
 *
 * For more information on hooks, actions, and filters,
 * {@link https://developer.wordpress.org/plugins/}
 *
 * @package WordPress
 * @subpackage Twenty_Fifteen
 * @since Twenty Fifteen 1.0
 */

/**
 * Set the content width based on the theme's design and stylesheet.
 *
 * @since Twenty Fifteen 1.0
 */
if ( ! isset( $content_width ) ) {
	$content_width = 660;
}

/**
 * Twenty Fifteen only works in WordPress 4.1 or later.
 */
if ( version_compare( $GLOBALS['wp_version'], '4.1-alpha', '<' ) ) {
	require get_template_directory() . '/inc/back-compat.php';
}

if ( ! function_exists( 'twentyfifteen_setup' ) ) :
	/**
	 * Sets up theme defaults and registers support for various WordPress features.
	 *
	 * Note that this function is hooked into the after_setup_theme hook, which
	 * runs before the init hook. The init hook is too late for some features, such
	 * as indicating support for post thumbnails.
	 *
	 * @since Twenty Fifteen 1.0
	 */
	function twentyfifteen_setup() {

		/*
		 * Make theme available for translation.
		 * Translations can be filed at WordPress.org. See: https://translate.wordpress.org/projects/wp-themes/twentyfifteen
		 * If you're building a theme based on twentyfifteen, use a find and replace
		 * to change 'twentyfifteen' to the name of your theme in all the template files.
		 *
		 * Manual loading of text domain is not required after the introduction of
		 * just in time translation loading in WordPress version 4.6.
		 *
		 * @ticket 58318
		 */

		if ( version_compare( $GLOBALS['wp_version'], '4.6', '<' ) ) {
			load_theme_textdomain( 'twentyfifteen' );
		}

		// Add default posts and comments RSS feed links to head.
		add_theme_support( 'automatic-feed-links' );

		/*
		 * Let WordPress manage the document title.
		 * By adding theme support, we declare that this theme does not use a
		 * hard-coded <title> tag in the document head, and expect WordPress to
		 * provide it for us.
		 */
		add_theme_support( 'title-tag' );

		/*
		 * Enable support for Post Thumbnails on posts and pages.
		 *
		 * See: https://developer.wordpress.org/reference/functions/add_theme_support/#post-thumbnails
		 */
		add_theme_support( 'post-thumbnails' );
		set_post_thumbnail_size( 825, 510, true );

		// This theme uses wp_nav_menu() in two locations.
		register_nav_menus(
			array(
				'primary' => __( 'Primary Menu', 'twentyfifteen' ),
				'social'  => __( 'Social Links Menu', 'twentyfifteen' ),
			)
		);

		/*
		 * Switch default core markup for search form, comment form, and comments
		 * to output valid HTML5.
		 */
		add_theme_support(
			'html5',
			array(
				'search-form',
				'comment-form',
				'comment-list',
				'gallery',
				'caption',
				'script',
				'style',
				'navigation-widgets',
			)
		);

		/*
		 * Enable support for Post Formats.
		 *
		 * See: https://developer.wordpress.org/advanced-administration/wordpress/post-formats/
		 */
		add_theme_support(
			'post-formats',
			array(
				'aside',
				'image',
				'video',
				'quote',
				'link',
				'gallery',
				'status',
				'audio',
				'chat',
			)
		);

		/*
		 * Enable support for custom logo.
		 *
		 * @since Twenty Fifteen 1.5
		 */
		add_theme_support(
			'custom-logo',
			array(
				'height'      => 248,
				'width'       => 248,
				'flex-height' => true,
			)
		);

		$color_scheme  = twentyfifteen_get_color_scheme();
		$default_color = trim( $color_scheme[0], '#' );

		// Setup the WordPress core custom background feature.

		add_theme_support(
			'custom-background',
			/**
			 * Filters Twenty Fifteen custom-background support arguments.
			 *
			 * @since Twenty Fifteen 1.0
			 *
			 * @param array $args {
			 *     An array of custom-background support arguments.
			 *
			 *     @type string $default-color      Default color of the background.
			 *     @type string $default-attachment Default attachment of the background.
			 * }
			 */
			apply_filters(
				'twentyfifteen_custom_background_args',
				array(
					'default-color'      => $default_color,
					'default-attachment' => 'fixed',
				)
			)
		);

		/*
		 * This theme styles the visual editor to resemble the theme style,
		 * specifically font, colors, icons, and column width. When fonts are
		 * self-hosted, the theme directory needs to be removed first.
		 */
		$font_stylesheet = str_replace(
			array( get_template_directory_uri() . '/', get_stylesheet_directory_uri() . '/' ),
			'',
			(string) twentyfifteen_fonts_url()
		);
		add_editor_style( array( 'css/editor-style.css', 'genericons/genericons.css', $font_stylesheet ) );

		// Load regular editor styles into the new block-based editor.
		add_theme_support( 'editor-styles' );

		// Load default block styles.
		add_theme_support( 'wp-block-styles' );

		// Add support for responsive embeds.
		add_theme_support( 'responsive-embeds' );

		// Add support for custom color scheme.
		add_theme_support(
			'editor-color-palette',
			array(
				array(
					'name'  => __( 'Dark Gray', 'twentyfifteen' ),
					'slug'  => 'dark-gray',
					'color' => '#111',
				),
				array(
					'name'  => __( 'Light Gray', 'twentyfifteen' ),
					'slug'  => 'light-gray',
					'color' => '#f1f1f1',
				),
				array(
					'name'  => __( 'White', 'twentyfifteen' ),
					'slug'  => 'white',
					'color' => '#fff',
				),
				array(
					'name'  => __( 'Yellow', 'twentyfifteen' ),
					'slug'  => 'yellow',
					'color' => '#f4ca16',
				),
				array(
					'name'  => __( 'Dark Brown', 'twentyfifteen' ),
					'slug'  => 'dark-brown',
					'color' => '#352712',
				),
				array(
					'name'  => __( 'Medium Pink', 'twentyfifteen' ),
					'slug'  => 'medium-pink',
					'color' => '#e53b51',
				),
				array(
					'name'  => __( 'Light Pink', 'twentyfifteen' ),
					'slug'  => 'light-pink',
					'color' => '#ffe5d1',
				),
				array(
					'name'  => __( 'Dark Purple', 'twentyfifteen' ),
					'slug'  => 'dark-purple',
					'color' => '#2e2256',
				),
				array(
					'name'  => __( 'Purple', 'twentyfifteen' ),
					'slug'  => 'purple',
					'color' => '#674970',
				),
				array(
					'name'  => __( 'Blue Gray', 'twentyfifteen' ),
					'slug'  => 'blue-gray',
					'color' => '#22313f',
				),
				array(
					'name'  => __( 'Bright Blue', 'twentyfifteen' ),
					'slug'  => 'bright-blue',
					'color' => '#55c3dc',
				),
				array(
					'name'  => __( 'Light Blue', 'twentyfifteen' ),
					'slug'  => 'light-blue',
					'color' => '#e9f2f9',
				),
			)
		);

		// Add support for custom color scheme.
		add_theme_support(
			'editor-gradient-presets',
			array(
				array(
					'name'     => __( 'Dark Gray Gradient', 'twentyfifteen' ),
					'slug'     => 'dark-gray-gradient-gradient',
					'gradient' => 'linear-gradient(90deg, rgba(17,17,17,1) 0%, rgba(42,42,42,1) 100%)',
				),
				array(
					'name'     => __( 'Light Gray Gradient', 'twentyfifteen' ),
					'slug'     => 'light-gray-gradient',
					'gradient' => 'linear-gradient(90deg, rgba(241,241,241,1) 0%, rgba(215,215,215,1) 100%)',
				),
				array(
					'name'     => __( 'White Gradient', 'twentyfifteen' ),
					'slug'     => 'white-gradient',
					'gradient' => 'linear-gradient(90deg, rgba(255,255,255,1) 0%, rgba(230,230,230,1) 100%)',
				),
				array(
					'name'     => __( 'Yellow Gradient', 'twentyfifteen' ),
					'slug'     => 'yellow-gradient',
					'gradient' => 'linear-gradient(90deg, rgba(244,202,22,1) 0%, rgba(205,168,10,1) 100%)',
				),
				array(
					'name'     => __( 'Dark Brown Gradient', 'twentyfifteen' ),
					'slug'     => 'dark-brown-gradient',
					'gradient' => 'linear-gradient(90deg, rgba(53,39,18,1) 0%, rgba(91,67,31,1) 100%)',
				),
				array(
					'name'     => __( 'Medium Pink Gradient', 'twentyfifteen' ),
					'slug'     => 'medium-pink-gradient',
					'gradient' => 'linear-gradient(90deg, rgba(229,59,81,1) 0%, rgba(209,28,51,1) 100%)',
				),
				array(
					'name'     => __( 'Light Pink Gradient', 'twentyfifteen' ),
					'slug'     => 'light-pink-gradient',
					'gradient' => 'linear-gradient(90deg, rgba(255,229,209,1) 0%, rgba(255,200,158,1) 100%)',
				),
				array(
					'name'     => __( 'Dark Purple Gradient', 'twentyfifteen' ),
					'slug'     => 'dark-purple-gradient',
					'gradient' => 'linear-gradient(90deg, rgba(46,34,86,1) 0%, rgba(66,48,123,1) 100%)',
				),
				array(
					'name'     => __( 'Purple Gradient', 'twentyfifteen' ),
					'slug'     => 'purple-gradient',
					'gradient' => 'linear-gradient(90deg, rgba(103,73,112,1) 0%, rgba(131,93,143,1) 100%)',
				),
				array(
					'name'     => __( 'Blue Gray Gradient', 'twentyfifteen' ),
					'slug'     => 'blue-gray-gradient',
					'gradient' => 'linear-gradient(90deg, rgba(34,49,63,1) 0%, rgba(52,75,96,1) 100%)',
				),
				array(
					'name'     => __( 'Bright Blue Gradient', 'twentyfifteen' ),
					'slug'     => 'bright-blue-gradient',
					'gradient' => 'linear-gradient(90deg, rgba(85,195,220,1) 0%, rgba(43,180,211,1) 100%)',
				),
				array(
					'name'     => __( 'Light Blue Gradient', 'twentyfifteen' ),
					'slug'     => 'light-blue-gradient',
					'gradient' => 'linear-gradient(90deg, rgba(233,242,249,1) 0%, rgba(193,218,238,1) 100%)',
				),
			)
		);

		// Indicate widget sidebars can use selective refresh in the Customizer.
		add_theme_support( 'customize-selective-refresh-widgets' );
	}
endif; // twentyfifteen_setup()
add_action( 'after_setup_theme', 'twentyfifteen_setup' );

/**
 * Register widget area.
 *
 * @since Twenty Fifteen 1.0
 *
 * @link https://developer.wordpress.org/reference/functions/register_sidebar/
 */
function twentyfifteen_widgets_init() {
	register_sidebar(
		array(
			'name'          => __( 'Widget Area', 'twentyfifteen' ),
			'id'            => 'sidebar-1',
			'description'   => __( 'Add widgets here to appear in your sidebar.', 'twentyfifteen' ),
			'before_widget' => '<aside id="%1$s" class="widget %2$s">',
			'after_widget'  => '</aside>',
			'before_title'  => '<h2 class="widget-title">',
			'after_title'   => '</h2>',
		)
	);
}
add_action( 'widgets_init', 'twentyfifteen_widgets_init' );

if ( ! function_exists( 'twentyfifteen_fonts_url' ) ) :
	/**
	 * Register fonts for Twenty Fifteen.
	 *
	 * @since Twenty Fifteen 1.0
	 * @since Twenty Fifteen 3.4 Replaced Google URL with self-hosted fonts.
	 *
	 * @return string Fonts URL for the theme.
	 */
	function twentyfifteen_fonts_url() {
		$fonts_url = '';
		$fonts     = array();

		/*
		 * translators: If there are characters in your language that are not supported
		 * by Noto Sans, translate this to 'off'. Do not translate into your own language.
		 */
		if ( 'off' !== _x( 'on', 'Noto Sans font: on or off', 'twentyfifteen' ) ) {
			$fonts[] = 'noto-sans';
		}

		/*
		 * translators: If there are characters in your language that are not supported
		 * by Noto Serif, translate this to 'off'. Do not translate into your own language.
		 */
		if ( 'off' !== _x( 'on', 'Noto Serif font: on or off', 'twentyfifteen' ) ) {
			$fonts[] = 'noto-serif';
		}

		/*
		 * translators: If there are characters in your language that are not supported
		 * by Inconsolata, translate this to 'off'. Do not translate into your own language.
		 */
		if ( 'off' !== _x( 'on', 'Inconsolata font: on or off', 'twentyfifteen' ) ) {
			$fonts[] = 'inconsolata';
		}

		if ( $fonts ) {
			$fonts_url = get_template_directory_uri() . '/assets/fonts/' . implode( '-plus-', $fonts ) . '.css';
		}

		return $fonts_url;
	}
endif;

/**
 * JavaScript Detection.
 *
 * Adds a `js` class to the root `<html>` element when JavaScript is detected.
 *
 * @since Twenty Fifteen 1.1
 */
function twentyfifteen_javascript_detection() {
	echo "<script>(function(html){html.className = html.className.replace(/\bno-js\b/,'js')})(document.documentElement);</script>\n";
}
add_action( 'wp_head', 'twentyfifteen_javascript_detection', 0 );

/**
 * Enqueue scripts and styles.
 *
 * @since Twenty Fifteen 1.0
 */
function twentyfifteen_scripts() {
	// Add custom fonts, used in the main stylesheet.
	$font_version = ( 0 === strpos( (string) twentyfifteen_fonts_url(), get_template_directory_uri() . '/' ) ) ? '20230328' : null;
	wp_enqueue_style( 'twentyfifteen-fonts', twentyfifteen_fonts_url(), array(), $font_version );

	// Add Genericons, used in the main stylesheet.
	wp_enqueue_style( 'genericons', get_template_directory_uri() . '/genericons/genericons.css', array(), '20201026' );

	// Load our main stylesheet.
	wp_enqueue_style( 'twentyfifteen-style', get_stylesheet_uri(), array(), '20241112' );

	// Theme block stylesheet.
	wp_enqueue_style( 'twentyfifteen-block-style', get_template_directory_uri() . '/css/blocks.css', array( 'twentyfifteen-style' ), '20240715' );

	// Register the Internet Explorer specific stylesheet.
	wp_register_style( 'twentyfifteen-ie', get_template_directory_uri() . '/css/ie.css', array( 'twentyfifteen-style' ), '20220908' );
	wp_style_add_data( 'twentyfifteen-ie', 'conditional', 'lt IE 9' );

	// Register the Internet Explorer 7 specific stylesheet.
	wp_register_style( 'twentyfifteen-ie7', get_template_directory_uri() . '/css/ie7.css', array( 'twentyfifteen-style' ), '20141210' );
	wp_style_add_data( 'twentyfifteen-ie7', 'conditional', 'lt IE 8' );

	// Skip-link fix is no longer enqueued by default.
	wp_register_script( 'twentyfifteen-skip-link-focus-fix', get_template_directory_uri() . '/js/skip-link-focus-fix.js', array(), '20230526', array( 'in_footer' => true ) );

	if ( is_singular() && comments_open() && get_option( 'thread_comments' ) ) {
		wp_enqueue_script( 'comment-reply' );
	}

	if ( is_singular() && wp_attachment_is_image() ) {
		wp_enqueue_script( 'twentyfifteen-keyboard-image-navigation', get_template_directory_uri() . '/js/keyboard-image-navigation.js', array( 'jquery' ), '20141210' );
	}

	wp_enqueue_script(
		'twentyfifteen-script',
		get_template_directory_uri() . '/js/functions.js',
		array( 'jquery' ),
		'20221101',
		array(
			'in_footer' => false, // Because involves header.
			'strategy'  => 'defer',
		)
	);
	wp_localize_script(
		'twentyfifteen-script',
		'screenReaderText',
		array(
			/* translators: Hidden accessibility text. */
			'expand'   => '<span class="screen-reader-text">' . __( 'expand child menu', 'twentyfifteen' ) . '</span>',
			/* translators: Hidden accessibility text. */
			'collapse' => '<span class="screen-reader-text">' . __( 'collapse child menu', 'twentyfifteen' ) . '</span>',
		)
	);
}
add_action( 'wp_enqueue_scripts', 'twentyfifteen_scripts' );

/**
 * Enqueue styles for the block-based editor.
 *
 * @since Twenty Fifteen 2.1
 */
function twentyfifteen_block_editor_styles() {
	// Block styles.
	wp_enqueue_style( 'twentyfifteen-block-editor-style', get_template_directory_uri() . '/css/editor-blocks.css', array(), '20240720' );
	// Add custom fonts.
	$font_version = ( 0 === strpos( (string) twentyfifteen_fonts_url(), get_template_directory_uri() . '/' ) ) ? '20230328' : null;
	wp_enqueue_style( 'twentyfifteen-fonts', twentyfifteen_fonts_url(), array(), $font_version );
}
add_action( 'enqueue_block_editor_assets', 'twentyfifteen_block_editor_styles' );


/**
 * Add preconnect for Google Fonts.
 *
 * @since Twenty Fifteen 1.7
 * @deprecated Twenty Fifteen 3.4 Disabled filter because, by default, fonts are self-hosted.
 *
 * @param array   $urls          URLs to print for resource hints.
 * @param string  $relation_type The relation type the URLs are printed.
 * @return array URLs to print for resource hints.
 */
function twentyfifteen_resource_hints( $urls, $relation_type ) {
	if ( wp_style_is( 'twentyfifteen-fonts', 'queue' ) && 'preconnect' === $relation_type ) {
		if ( version_compare( $GLOBALS['wp_version'], '4.7-alpha', '>=' ) ) {
			$urls[] = array(
				'href' => 'https://fonts.gstatic.com',
				'crossorigin',
			);
		} else {
			$urls[] = 'https://fonts.gstatic.com';
		}
	}

	return $urls;
}
// add_filter( 'wp_resource_hints', 'twentyfifteen_resource_hints', 10, 2 );

/**
 * Add featured image as background image to post navigation elements.
 *
 * @since Twenty Fifteen 1.0
 *
 * @see wp_add_inline_style()
 */
function twentyfifteen_post_nav_background() {
	if ( ! is_single() ) {
		return;
	}

	$previous = ( is_attachment() ) ? get_post( get_post()->post_parent ) : get_adjacent_post( false, '', true );
	$next     = get_adjacent_post( false, '', false );
	$css      = '';

	if ( is_attachment() && 'attachment' === $previous->post_type ) {
		return;
	}

	if ( $previous && has_post_thumbnail( $previous->ID ) ) {
		$prevthumb = wp_get_attachment_image_src( get_post_thumbnail_id( $previous->ID ), 'post-thumbnail' );
		$css      .= '
			.post-navigation .nav-previous { background-image: url(' . esc_url( $prevthumb[0] ) . '); }
			.post-navigation .nav-previous .post-title, .post-navigation .nav-previous a:hover .post-title, .post-navigation .nav-previous .meta-nav { color: #fff; }
			.post-navigation .nav-previous a:before { background-color: rgba(0, 0, 0, 0.4); }
		';
	}

	if ( $next && has_post_thumbnail( $next->ID ) ) {
		$nextthumb = wp_get_attachment_image_src( get_post_thumbnail_id( $next->ID ), 'post-thumbnail' );
		$css      .= '
			.post-navigation .nav-next { background-image: url(' . esc_url( $nextthumb[0] ) . '); border-top: 0; }
			.post-navigation .nav-next .post-title, .post-navigation .nav-next a:hover .post-title, .post-navigation .nav-next .meta-nav { color: #fff; }
			.post-navigation .nav-next a:before { background-color: rgba(0, 0, 0, 0.4); }
		';
	}

	wp_add_inline_style( 'twentyfifteen-style', $css );
}
add_action( 'wp_enqueue_scripts', 'twentyfifteen_post_nav_background' );

/**
 * Display descriptions in main navigation.
 *
 * @since Twenty Fifteen 1.0
 *
 * @param string   $item_output The menu item's starting HTML output.
 * @param WP_Post  $item        Menu item data object.
 * @param int      $depth       Depth of the menu. Used for padding.
 * @param stdClass $args        An object of wp_nav_menu() arguments.
 * @return string Menu item with possible description.
 */
function twentyfifteen_nav_description( $item_output, $item, $depth, $args ) {
	if ( 'primary' === $args->theme_location && $item->description ) {
		$item_output = str_replace( $args->link_after . '</a>', '<div class="menu-item-description">' . $item->description . '</div>' . $args->link_after . '</a>', $item_output );
	}

	return $item_output;
}
add_filter( 'walker_nav_menu_start_el', 'twentyfifteen_nav_description', 10, 4 );

/**
 * Add a `screen-reader-text` class to the search form's submit button.
 *
 * @since Twenty Fifteen 1.0
 *
 * @param string $html Search form HTML.
 * @return string Modified search form HTML.
 */
function twentyfifteen_search_form_modify( $html ) {
	return str_replace( 'class="search-submit"', 'class="search-submit screen-reader-text"', $html );
}
add_filter( 'get_search_form', 'twentyfifteen_search_form_modify' );

/**
 * Modifies tag cloud widget arguments to display all tags in the same font size
 * and use list format for better accessibility.
 *
 * @since Twenty Fifteen 1.9
 *
 * @param array $args Arguments for tag cloud widget.
 * @return array The filtered arguments for tag cloud widget.
 */
function twentyfifteen_widget_tag_cloud_args( $args ) {
	$args['largest']  = 22;
	$args['smallest'] = 8;
	$args['unit']     = 'pt';
	$args['format']   = 'list';

	return $args;
}
add_filter( 'widget_tag_cloud_args', 'twentyfifteen_widget_tag_cloud_args' );

/**
 * Prevents `author-bio.php` partial template from interfering with rendering
 * an author archive of a user with the `bio` username.
 *
 * @since Twenty Fifteen 2.6
 *
 * @param string $template Template file.
 * @return string Replacement template file.
 */
function twentyfifteen_author_bio_template( $template ) {
	if ( is_author() ) {
		$author = get_queried_object();
		if ( $author instanceof WP_User && 'bio' === $author->user_nicename ) {
			// Use author templates if exist, fall back to template hierarchy otherwise.
			return locate_template( array( "author-{$author->ID}.php", 'author.php' ) );
		}
	}

	return $template;
}
add_filter( 'author_template', 'twentyfifteen_author_bio_template' );


/**
 * Implement the Custom Header feature.
 *
 * @since Twenty Fifteen 1.0
 */
require get_template_directory() . '/inc/custom-header.php';

/**
 * Custom template tags for this theme.
 *
 * @since Twenty Fifteen 1.0
 */
require get_template_directory() . '/inc/template-tags.php';

/**
 * Customizer additions.
 *
 * @since Twenty Fifteen 1.0
 */
require get_template_directory() . '/inc/customizer.php';

/**
 * Register block patterns and pattern categories.
 *
 * @since Twenty Fifteen 3.9
 */
function twentyfifteen_register_block_patterns() {
	require get_template_directory() . '/inc/block-patterns.php';
}

add_action( 'init', 'twentyfifteen_register_block_patterns' );
<!DOCTYPE html>
<html lang="de" class="no-js">
<head>
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<b>Fatal error</b>:  Uncaught Error: Call to undefined function twentyfifteen_post_thumbnail() in /srv/www/vhosts/al-treuhand.ch/httpdocs/wp-content/themes/twentyfifteen/content-page.php:14
Stack trace:
#0 /srv/www/vhosts/al-treuhand.ch/httpdocs/wp-includes/template.php(812): require()
#1 /srv/www/vhosts/al-treuhand.ch/httpdocs/wp-includes/template.php(745): load_template()
#2 /srv/www/vhosts/al-treuhand.ch/httpdocs/wp-includes/general-template.php(206): locate_template()
#3 /srv/www/vhosts/al-treuhand.ch/httpdocs/wp-content/themes/twentyfifteen/page.php(25): get_template_part()
#4 /srv/www/vhosts/al-treuhand.ch/httpdocs/wp-includes/template-loader.php(106): include('...')
#5 /srv/www/vhosts/al-treuhand.ch/httpdocs/wp-blog-header.php(19): require_once('...')
#6 /srv/www/vhosts/al-treuhand.ch/httpdocs/index.php(17): require('...')
#7 {main}
  thrown in <b>/srv/www/vhosts/al-treuhand.ch/httpdocs/wp-content/themes/twentyfifteen/content-page.php</b> on line <b>14</b><br />