Title: DevTools failed to load source map Last modified: October 25, 2022 --- # DevTools failed to load source map * Resolved [c_dilla](https://wordpress.org/support/users/c_dilla/) * (@c_dilla) * [3 years, 7 months ago](https://wordpress.org/support/topic/devtools-failed-to-load-source-map-6/) * Hello, I’m getting an error message everywhere on the administration backend after installing this plugin and it breaks some functionality. * If I try to manually open the map-file I get a 404 as well but if I check with a file manager the file is there. * Is there something I’m missing or any way to fix this? Could there be a conflict with a security plugin blocking access to map-files through .htaccess for example? If so, I can’t find it again… * > DevTools failed to load source map: Could not load content for [https://mydomain.com/wp-content/plugins/wp-smushit/app/assets/js/smush-global.min.js.map](https://mydomain.com/wp-content/plugins/wp-smushit/app/assets/js/smush-global.min.js.map): > HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE - This topic was modified 3 years, 7 months ago by [c_dilla](https://wordpress.org/support/users/c_dilla/). Viewing 3 replies - 1 through 3 (of 3 total) * Plugin Support [Laura – WPMU DEV Support](https://wordpress.org/support/users/wpmudev-support8/) * (@wpmudev-support8) * [3 years, 7 months ago](https://wordpress.org/support/topic/devtools-failed-to-load-source-map-6/#post-16135073) * Hi [@c_dilla](https://wordpress.org/support/users/c_dilla/) * I hope you’re well today! * The error about source maps will not break any functionality about the site. The “source map” is a special file that is used only to make it easier for developers to check code in minified JS file in a human readable form. It does not affect in any way whether a given script works or not and doesn’t affect site in any way. * Furthermore, this “error” ONLY happens if you do have browser console/webdeveloper tools open. When you close it, it’s not happening. I mean – it is not “invisible” then but literally does not happen as browser does not look for such files then. * You can absolutely safely ignore it and it will not affect the site. * I understand that there are some issues with site after installing the plugin but they’d be caused by something else. I understand that when checking you have noticed this “source map” issue in browser but would you, please, describe what functionality (as you mentioned: “it breaks some functionality”) is broken and in what way? * Kind regards, Adam * Thread Starter [c_dilla](https://wordpress.org/support/users/c_dilla/) * (@c_dilla) * [3 years, 7 months ago](https://wordpress.org/support/topic/devtools-failed-to-load-source-map-6/#post-16135170) * I had problems with the functionality before but I can’t seem to replicate it now… I’ll enable the plugin again and keep testing. But if I go to Smush settings I’m getting seven warnings and three errors (for font files) now for example which is a bit much. Again, it could be because of my strict security settings but this is the only plugin that is giving me warning/error messages. * Anyway, I trust you when you say that map files are not important and won’t break any functionality. I’ll mark this as resolved. * > GET [https://mydomain.com/wp-content/plugins/wp-smushit/core/external/plugin-notice/assets/fonts/wpmudev-close-icon.ttf?v4kr59](https://mydomain.com/wp-content/plugins/wp-smushit/core/external/plugin-notice/assets/fonts/wpmudev-close-icon.ttf?v4kr59) > net::ERR_ABORTED 404 (Not Found) > GET [https://mydomain.com/wp-content/plugins/wp-smushit/core/external/plugin-notice/assets/fonts/wpmudev-close-icon.woff2?v4kr59](https://mydomain.com/wp-content/plugins/wp-smushit/core/external/plugin-notice/assets/fonts/wpmudev-close-icon.woff2?v4kr59) > net::ERR_ABORTED 404 (Not Found) > GET [https://mydomain.com/wp-content/plugins/wp-smushit/app/assets/fonts/wpmudev-plugin-icons.ttf](https://mydomain.com/wp-content/plugins/wp-smushit/app/assets/fonts/wpmudev-plugin-icons.ttf) > net::ERR_ABORTED 404 (Not Found) - This reply was modified 3 years, 7 months ago by [c_dilla](https://wordpress.org/support/users/c_dilla/). * Plugin Support [Laura – WPMU DEV Support](https://wordpress.org/support/users/wpmudev-support8/) * (@wpmudev-support8) * [3 years, 7 months ago](https://wordpress.org/support/topic/devtools-failed-to-load-source-map-6/#post-16136332) * Hi [@c_dilla](https://wordpress.org/support/users/c_dilla/) * Thank you for response! * As for font file – it may be related to strict security settings (though worse case scenario – should only affect how plugin looks and not how it works) but it may also be a matter of, e.g., unexpectedly broken installation. I think you could try re-installing the plugin first before re-enabling it. * If you come across any further issues, feel free to let us know and we’ll be glad to assist. * Kind regadrs, Adam Viewing 3 replies - 1 through 3 (of 3 total) The topic ‘DevTools failed to load source map’ is closed to new replies. * ![](https://ps.w.org/wp-smushit/assets/icon-256x256.gif?rev=3447113) * [Smush – Image Optimization, Compression, Lazy Load, WebP & CDN](https://wordpress.org/plugins/wp-smushit/) * [Frequently Asked Questions](https://wordpress.org/plugins/wp-smushit/#faq) * [Support Threads](https://wordpress.org/support/plugin/wp-smushit/) * [Active Topics](https://wordpress.org/support/plugin/wp-smushit/active/) * [Unresolved Topics](https://wordpress.org/support/plugin/wp-smushit/unresolved/) * [Reviews](https://wordpress.org/support/plugin/wp-smushit/reviews/) ## Tags * [map](https://wordpress.org/support/topic-tag/map/) * [smush](https://wordpress.org/support/topic-tag/smush/) * 3 replies * 2 participants * Last reply from: [Laura – WPMU DEV Support](https://wordpress.org/support/users/wpmudev-support8/) * Last activity: [3 years, 7 months ago](https://wordpress.org/support/topic/devtools-failed-to-load-source-map-6/#post-16136332) * Status: resolved