[SOLVED][Drupal][Drupal Panels] An AJAX HTTP error occurred. HTTP Result Code: 200
Many Drupal users had encountered the following error in a modal window when using Panels after clicking on the settings cog to add content to a panel layout. "An AJAX HTTP error occurred. HTTP Result Code: 200 Debugging information follows." If you are facing the same perplexing error message in your Drupal then read on to find out the fix.
This seems to have occurred because of a Javascript conflict with some other module or theme. Many users solved the issue by doing the following.
- Removing the Drupal for Firebug addon (This did the trick for a majority of the users who reported the issue).
- Disabling Firebug.
- Flushing the theme's cache.
- Uninstalling Jquery UI and Jquery Update modules.
- Removing the Twitter Profile module solved the issue for a small number of users.
- Disabling the Theme Developer module solved the issues for a user.
Hope that helps.
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Reference: http://drupal.org/node/1160788
