I’ve been using the Breezing Forms fork of the Facile Forms powerful form creation component and module for Joomla 1.5 for a while now. During development of a recent project, however, I suddenly starting having problems. Upon form submission, I’d get sent to a 404 page with the error message “Article #0 not found.”

After addressing every possible cause I could think of, in desperation I tried turning Legacy Mode off. It worked! Go to Plug-in Manager > System - Legacy, and click off if it is enabled.

Of course I needed to scramble a bit to eliminate the need for Legacy mode. I found out the hard way that Joomla 1.5 Legacy mode and Breezing Forms don’t mix!