I assume this is still the correct forum as it relates to the user registration module, UE4 etc.
just to reiterate
I uninstalled DFP and installed UE I then deleted the cache and rebooted the PC.
I started dreamweaver ansd opened my site based on the USer registration module.
Opened the page users_profile_1 and added five rows to the table.
I then opened the forms tab and pressed the file field option.
The file field is created but after that the error appears (screen dump attatched).
Thought about reinstalling DFP but I'm not sure.