Critical Error in Classic Editor – Unable to Publish Posts

  • I’m experiencing a publishing issue with the WordPress Classic Editor. When trying to publish a post, I see the following error message in red:

    “CRITICAL ERROR: SYSTEM UPGRADE REQUIRED”

    This appears in the publish panel where the publish button should normally be. The error completely prevents me from publishing any new posts using the Classic Editor.

    Important details:

    • The exact error message is: “CRITICAL ERROR: SYSTEM UPGRADE REQUIRED”
    • The error appears in a red box in the publish panel
    • The error only occurs in Classic Editor
    • The default WordPress Block Editor (Gutenberg) works fine and lets me publish posts

    Current workaround:
    I can temporarily publish posts by disabling the Classic Editor plugin and using the default Block Editor instead.

    Looking for help to resolve this issue so I can continue using the Classic Editor. Any suggestions would be appreciated.

Viewing 1 replies (of 1 total)
  • sanjaymarthak

    (@sanjaymarthak)

    Hello, Wisharl,

    This error may occur due to:

    1. Plugin Conflicts: Outdated or corrupted plugins.
    2. PHP Memory Limit Exhaustion: Insufficient PHP memory.
    3. Outdated PHP Version: Incompatible PHP version.
    4. File Corruption: Damaged core, theme, or plugin files.

    Quick Fixes

    1. Enable Debug Mode:

      Edit wp-config.php

      define('WP_DEBUG', true);
      define('WP_DEBUG_LOG', true);
      define('WP_DEBUG_DISPLAY', false);
    2. Check Plugins: Deactivate all plugins; reactivate one by one to find the culprit.
    3. Increase Memory Limit: Add to wp-config.php
      define('WP_MEMORY_LIMIT', '256M');
    4. Update PHP: Ensure your hosting supports a compatible PHP version.

    For details, see Debugging in WordPress.

    Let me know if you need further help!

    Best Regards,
    Sanjay Marthak

Viewing 1 replies (of 1 total)
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