BugWP logo BugWP
Back to Community
Home / Community / Plugin → The events calendar

Troubleshooting 404 and CSS Errors in The Events Calendar

22 threads Sep 9, 2025 Plugin → The events calendar

Content

Many users of The Events Calendar plugin encounter 404 (Not Found) errors or issues with missing CSS files. These problems often manifest as broken styling on calendar pages, warnings in browser consoles, or a flood of 404 entries in server logs. This guide will help you understand why these errors occur and provide the most effective steps to resolve them.

Why Do These Errors Happen?

Based on community reports, these errors typically stem from a few common sources:

  • Aggressive Caching: Server-level, plugin, or theme caching can serve outdated file paths that no longer exist after a plugin update.
  • Plugin or Theme Conflicts: Another plugin or your theme might be enqueuing its own versions of scripts or stylesheets that conflict with The Events Calendar, or it might be incorrectly processing file paths.
  • Known Plugin Bugs: The Events Calendar team has acknowledged internal bugs where the plugin attempts to load CSS files that do not exist, such as frontend.css or customizer-views-v2-controls.css.
  • Block Editor Issues: Some errors are tied to the block editor (Gutenberg), where a faulty block or widget might be trying to load invalid resources.

Common Solutions to Try

1. Clear All Caches

This is the most common and effective first step. Caching is a frequent culprit for 404 errors on recently changed files.

  • Clear your WordPress caching plugin's cache (e.g., W3 Total Cache, WP Rocket).
  • Clear your server-level cache (e.g., Varnish, NGINX, or your hosting provider's caching tool).
  • Clear your browser cache or test in a private/incognito window.
  • If you use a Content Delivery Network (CDN) like Cloudflare, purge its cache as well.

2. Perform a Conflict Test

A conflict with another plugin or your theme is a very common cause. To test for this:

  1. Switch Themes Temporarily: Activate a default WordPress theme like Twenty Twenty-Four. If the error disappears, the issue is likely with your main theme. You will need to contact your theme's support for assistance.
  2. Deactivate Plugins: Deactivate all plugins except The Events Calendar. If the error is resolved, reactivate your plugins one by one to identify which one is causing the conflict.

3. Check for Known Issues and Workarounds

The Events Calendar team has confirmed several bugs related to missing CSS files. While waiting for an official fix, you can use these workarounds:

  • For missing frontend.css: This error is referenced in internal bug reports. A common workaround is to manually dequeue the faulty style sheet by adding the following code to your theme's functions.php file: 
    function tec_dequeue_missing_css() {
    wp_dequeue_style( 'tribe-events-featured-image-frontend' ); 
}
add_action( 'wp_enqueue_scripts', 'tec_dequeue_missing_css', 100 );
  • For other missing files: If you have identified a specific file causing 404s, a similar dequeue script can be used. You will need to find the correct handle name used when the file is enqueued.

4. Verify File Existence

If you are comfortable accessing your site's file system, you can verify whether a file your browser is trying to load actually exists on the server. Use an FTP client or your host's file manager to navigate to the path shown in the 404 error (e.g., wp-content/plugins/the-events-calendar/src/resources/css/) and check if the requested file is there.

5. Reinstall the Plugin

A incomplete update or file corruption can cause these issues. Try completely uninstalling The Events Calendar (ensure you have a backup first) and then reinstalling it fresh from the WordPress plugin repository.

When to Report a Bug

If you have tried all the steps above and the error persists, and you are certain it is not a conflict, you may have encountered a new bug. The Events Calendar team encourages users to report these issues. When reporting, be sure to include your PHP version, WordPress version, The Events Calendar version, and your active theme name to help developers replicate the problem.

Persistent 404 errors for resources are often a nuisance rather than a critical failure, but resolving them improves site performance and user experience. The steps outlined here resolve the majority of these reported issues.

Related Support Threads Support