I don't know what "error" was being reported, so can't help much. If you look in your /logs folder, there will be a couple of files named myDEBUG-adm-*.log. One of them will contain the details of the error you experienced.

If you post a log's contents, use the "CODE" tags (the big # in the menu-bar when you're writing your post) and make sure to xxx-out your admin folder's name.