DataTables warning: JSON data from server could not be parsed. Caused by a JSON formatting error

Hi,

I had a nice app using datatables and mysql running on my windows 7 pc. I ported everything to RHEL4 and everything should be working (did not change anything as far as the backend database or php scripts and the directory structure); however, now I'm getting the following error when I attempt to access the main page which uses Datatables:

DataTables warning (table id = 'example'): DataTables warning: JSON data from server could not be parsed. This is caused by a JSON formatting error.

I did not change anything that should cause any differences. The data is identical as well.

Any ideas on how I can debug this?

Thank you