Drupal For Firebug Breaks IMCE

Hello,

I am running the latest versions of Drupal 6, Drupal for Firebug, CKEditor, and IMCE. When enable Drupal for Firebug, I am unable to use IMCE in conjunction with CKEditor. Whenever I try to browse the server, I get the following message:

Server error

The website encountered an error while retrieving http://MYSITE.com/imce?app=ckeditor%7Csendto%40ckeditor_fileUrl%7C&CKEditor=edit-body&CKEditorFuncNum=1&langCode=en. It may be down for maintenance or configured incorrectly.

Here are some suggestions:
Reload this web page later.
HTTP Error 500 (Internal Server Error): An unexpected condition was encountered while the server was attempting to fulfill the request.