An AJAX HTTP error occurred. HTTP Result Code: 500 Everytime I try to edit content on one of my panels I get the following error message.

An AJAX HTTP error occurred.
HTTP Result Code: 500
Debugging information follows.
Path: /panels/ajax/editor/edit-pane/panel_context%3Apage-   sign_up_page%3A%3Apage_sign_up_page_panel_context%3A%3A%3A%3A/417
StatusText: Internal Server Error
ResponseText: 


I am using Panels 7.x-3.5.  Anyone have any idea how to go about fixing this?
You guys were right and it was a problem with CKEditor and Media not working well together.  I fixed it using a patch found here: https://www.drupal.org/node/2455391