Warning: require(//wp-includes/theme-previews.php): Failed to open stream: No such file or directory in /wp-settings.php on line 184

Fatal error: Uncaught Error: Failed opening required '//wp-includes/theme-previews.php' (include_path='.:/usr/local/share/pear') in /wp-settings.php:184 Stack trace: #0 /wp-config.php(101): require_once() #1 /wp-load.php(50): require_once('/wp-config.php') #2 /wp-blog-header.php(13): require_once('/wp-load.php') #3 /index.php(17): require('/wp-blog-header...') #4 {main} thrown in /wp-settings.php on line 184

Fatal error: Uncaught Error: Call to a member function set() on null in /wp-includes/l10n.php:806 Stack trace: #0 /wp-includes/l10n.php(900): load_textdomain('default', '//wp-content/la...', 'hu_HU') #1 /wp-includes/class-wp-fatal-error-handler.php(47): load_default_textdomain() #2 [internal function]: WP_Fatal_Error_Handler->handle() #3 {main} thrown in /wp-includes/l10n.php on line 806