Autocomplete not working

Nov 14, 2014 at 6:40 PM
When trying to use the autocomplete feature I am getting a 500 internal server error. This happens when calling the FieldAutocompleteHandler.ashx.

When I try and run it manually the error I get is:
"The page you selected contains a list that does not exist. It may have been deleted by another user."

I know the list is available and it is getting the list GUID properly.

Any thought on what I should check?