[SOLVED][Drupal][Drupal Panels] An AJAX HTTP error occurred. HTTP Result Code: 200

November 19, 2012 - 16:56

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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Post your comments / questions

Thing is, these problems with Ajax / Jquery are becoming real showstoppers. Especially when experiencing problems/crashes without having any of the modules mentioned installed... Where to begin?

I think the easiest way to start debugging AJAX/jQuery errors is with Firebug or Inspect in Chrome. Set up breakpoints in JS. Try invoking the AJAX call from the console to see what happens. If that does not work you can always hire us :-).

I had the problem as well. Dropping the jQuery update version to 1.5 for administrative pages made it work. Hope this helps.