Title: Uncaught Error: locate_file() in class-admin-css-load-optimizer.php:49 Last modified: May 4, 2021 --- # Uncaught Error: locate_file() in class-admin-css-load-optimizer.php:49 * Resolved [daniel908](https://wordpress.org/support/users/daniel908/) * (@daniel908) * [5 years, 1 month ago](https://wordpress.org/support/topic/uncaught-error-locate_file-in-class-admin-css-load-optimizer-php49/) * Hi there, I have an issue with foogallery causing lots of errors (full error log line below). This seems to cause 500 errors in Elementor when saving pages with a foogallery included. Any idea how to solve that issue? * FooGallery 2.0.24 Wordpress 5.7.1 Theme Jupiter X 1.23.0 with Elementor * `[Tue May 04 22:23:05.167381 2021] [proxy_fcgi:error] [pid 10120:tid 140266292610816][ client 83.135.223.230:53117] AH01071: Got error 'PHP message: PHP Fatal error: Uncaught Error: Call to a member function locate_file() on null in /path/to/wordpress/ wp-content/plugins/foogallery/includes/admin/class-admin-css-load-optimizer.php: 49\nStack trace:\n#0 /path/to/wordpress/wp-includes/class-wp-hook.php(292): FooGallery_Admin_CSS_Load_Optimizer- >attach_shortcode_to_post()\n#1 /path/to/wordpress/wp-includes/class-wp-hook. php(316): WP_Hook->apply_filters()\n#2 /path/to/wordpress/wp-includes/plugin. php(484): WP_Hook->do_action()\n#3 /path/to/wordpress/wp-content/plugins/foogallery/ includes/compatibility/class-elementor-compatibility.php(49): do_action()\n#4/ path/to/wordpress/wp-includes/class-wp-hook.php(292): FooGallery_Elementor_Compa...', referer: https://www.hertrich.photo/wp-admin/post.php?post=7388&action=elementor` Viewing 4 replies - 1 through 4 (of 4 total) * Plugin Support [elviiso](https://wordpress.org/support/users/elviiso/) * (@elviiso) * [5 years, 1 month ago](https://wordpress.org/support/topic/uncaught-error-locate_file-in-class-admin-css-load-optimizer-php49/#post-14407675) * Hi [@daniel908](https://wordpress.org/support/users/daniel908/) * I have been trying to replicate this issue from my end to try to see if I will experience the same error message. * I did so on a fresh WordPress install and installed the latest version of Elementor PRO page builder and the free version of FooGallery and used the default WordPress theme. I then created a page using Elementor and added a FooGallery gallery and published it but did not experience such an error. I then edited the page and added another gallery and image and saved it without any such errors in that second case too. Because of this, I highly doubt if the issue is simply being caused by a conflict between FooGallery and Elementor plugins. * However, to investigate this further just to be certain, could you kindly navigate to FooGallery-> System Info and paste all of that data in your reply to this message so that we can carry out further analysis of this? Thanks in advance. * Hope to hear from you soon. * Kind regards, Elvis * Thread Starter [daniel908](https://wordpress.org/support/users/daniel908/) * (@daniel908) * [5 years, 1 month ago](https://wordpress.org/support/topic/uncaught-error-locate_file-in-class-admin-css-load-optimizer-php49/#post-14409261) * Hi Elvis, thanks for your feedback and testing! I tried by deactivating many plugins in my installation that I foud suspicious in regard to conflicts, but I did not find the right plugin yet as it seems. I could not make the error go away. I did not test deactivating all plugins, though. * Here is the info you requested: * ``` FooGallery-Version : 2.0.24 WordPress-Version : 5.7.1 Aktiviertes Theme : JupiterX WordPress-URL : https://www.hertrich.photo PHP-Version : 7.4.16 Thumb Engine : default PHP GD : Geladen (V2) PHP Imagick : Geladen WP Image Editor : FooGallery_Thumb_Image_Editor_Imagick Vorschaubild-Erzeugungstest : https://www.hertrich.photo/wp-content/uploads/2019/06/daniel-hertrich-photography-Immobilien-Real-Estate-Fotografie-Ingolstadt-Bayern-A7R07635.jpg HTTPS Thumb Mismatch : Keine Available Image Editors : Array ( [0] => FooGallery_Thumb_Image_Editor_Imagick [1] => FooGallery_Thumb_Image_Editor_GD ) PHP Open SSL : Geladen PHP HTTP Wrapper : Gefunden PHP HTTPS Wrapper : Gefunden PHP Config[allow_url_fopen] : 1 PHP Config[allow_url_include] : 1 Aktive Erweiterungen : Array ( [0] => foobox ) Galerie-Vorlagen : Array ( [0] => default [1] => image-viewer [2] => justified [3] => masonry [4] => simple_portfolio [5] => thumbnail ) Lightboxes : Array ( [foobox] => FooBox ) Einstellungen : Array ( [enable_html_cache] => on [gallery_template] => justified [gallery_sorting] => [default_gallery_settings] => 7396 [caption_title_source] => caption [caption_desc_source] => desc [thumb_engine] => default [default_retina_support|2x] => on [shortpixel_quality] => lossy [shortpixel_return] => wait [shortpixel_conversion] => [language_imageviewer_prev_text] => Zurück [language_imageviewer_next_text] => Vor [language_imageviewer_of_text] => von [language_images_count_none_text] => Keine Bilder [language_images_count_single_text] => 1 Bild [language_images_count_plural_text] => %s Bilder [enable_custom_ready] => on [force_hide_trial] => on [pro_promo_disabled] => on [custom_js] => [custom_css] => [default_retina_support] => Array ( [2x] => true [3x] => false [4x] => false ) ) Aktive Plugins : Array ( [0] => foogallery/foogallery.php [1] => add-on-woocommerce-mailpoet/add-on-woocommerce-mailpoet.php [2] => advanced-custom-fields/acf.php [3] => classic-editor/classic-editor.php [4] => contact-form-7/wp-contact-form-7.php [5] => disable-gutenberg/disable-gutenberg.php [6] => duplicator/duplicator.php [7] => easy-table-of-contents/easy-table-of-contents.php [8] => elementor/elementor.php [9] => facebook-for-woocommerce/facebook-for-woocommerce.php [10] => foobox-image-lightbox/foobox-free.php [11] => health-check/health-check.php [12] => image-hover-effects-addon-for-elementor/image-hover-effects-addon-for-elementor.php [13] => insert-pages/insert-pages.php [14] => jet-elements/jet-elements.php [15] => jet-popup/jet-popup.php [16] => jet-tabs/jet-tabs.php [17] => jet-tricks/jet-tricks.php [18] => jupiterx-core/jupiterx-core.php [19] => kliken-marketing-for-google/kliken-marketing-for-google.php [20] => mailpoet-premium/mailpoet-premium.php [21] => mailpoet/mailpoet.php [22] => media-library-assistant/index.php [23] => menu-icons/menu-icons.php [24] => mobile-assistant-connector/mobassistantconnector.php [25] => photonic/photonic.php [26] => pixelyoursite/facebook-pixel-master.php [27] => raven/raven.php [28] => redirection/redirection.php [29] => speed-booster-pack/speed-booster-pack.php [30] => woocommerce-customizer/woocommerce-customizer.php [31] => woocommerce-gateway-amazon-payments-advanced/woocommerce-gateway-amazon-payments-advanced.php [32] => woocommerce-gateway-paypal-express-checkout/woocommerce-gateway-paypal-express-checkout.php [33] => woocommerce-gateway-stripe/woocommerce-gateway-stripe.php [34] => woocommerce-germanized/woocommerce-germanized.php [35] => woocommerce-pdf-invoices-packing-slips/woocommerce-pdf-invoices-packingslips.php [36] => woocommerce-services/woocommerce-services.php [37] => woocommerce/woocommerce.php [38] => wordpress-importer/wordpress-importer.php [39] => wordpress-seo/wp-seo.php [40] => wp-sweep/wp-sweep.php [41] => wplr-sync/wplr-sync.php [42] => wunderwp/wunderwp.php ) ``` * Plugin Support [elviiso](https://wordpress.org/support/users/elviiso/) * (@elviiso) * [5 years, 1 month ago](https://wordpress.org/support/topic/uncaught-error-locate_file-in-class-admin-css-load-optimizer-php49/#post-14410822) * Hi [@daniel908](https://wordpress.org/support/users/daniel908/) * Could you kindly use this guide which will give you a safer way and environment to troubleshoot and identify the plugin causing this issue? Thanks in advance. [https://fooplugins.com/documentation/general/general-troubleshooting/health-check-debug/](https://fooplugins.com/documentation/general/general-troubleshooting/health-check-debug/) * Kindly update me once done with this.Thanks in advance. * Kind regards, Elvis. * Plugin Support [elviiso](https://wordpress.org/support/users/elviiso/) * (@elviiso) * [5 years ago](https://wordpress.org/support/topic/uncaught-error-locate_file-in-class-admin-css-load-optimizer-php49/#post-14446498) * Hi [@daniel908](https://wordpress.org/support/users/daniel908/) * We haven’t heard from you in a while, so we presume the problem has been resolved and we’re closing this support ticket. * If you are still experiencing the problem, then please open a new support ticket. * Regards, Elvis. Viewing 4 replies - 1 through 4 (of 4 total) The topic ‘Uncaught Error: locate_file() in class-admin-css-load-optimizer.php:49’ is closed to new replies. * ![](https://ps.w.org/foogallery/assets/icon-256x256.gif?rev=2602542) * [Photo Gallery by FooGallery : Responsive Image Gallery, Masonry Gallery & Carousel](https://wordpress.org/plugins/foogallery/) * [Frequently Asked Questions](https://wordpress.org/plugins/foogallery/#faq) * [Support Threads](https://wordpress.org/support/plugin/foogallery/) * [Active Topics](https://wordpress.org/support/plugin/foogallery/active/) * [Unresolved Topics](https://wordpress.org/support/plugin/foogallery/unresolved/) * [Reviews](https://wordpress.org/support/plugin/foogallery/reviews/) * 4 replies * 2 participants * Last reply from: [elviiso](https://wordpress.org/support/users/elviiso/) * Last activity: [5 years ago](https://wordpress.org/support/topic/uncaught-error-locate_file-in-class-admin-css-load-optimizer-php49/#post-14446498) * Status: resolved