delete file doesn't work

Hi, I want to delete the old thumb file when I update with a new, but when I select the Delete SB I get this message:
'There are no delete or update transactions on page. Please insert an appropriate transaction first.'
I the update record, I try to build a page without the DataAssist wizard but I get the same thing.
I use Dreamweaver CS3 (win xp sp3), Digital File Pro 2.0.0 and DataAssist 2.0.4.

This is a conflict with the ADDT server behavior, which is actually creating that message. You can either install the latest version of Digital File Pro or uninstall ADDT to correct the problem.

Thankyou very much Ray now works fine.
Sorry about the question but what trigger I must use from delete file to delete the old pic only if I upload a new pic ?
Sometimes I need only to update other data and not the pic.

I think there is an "upload successful" binding that would work for that.

Yes, I build a update page like the flash tutorial (06_upload_update_pt1.swf) but when I update the page and I not change the pic file, the update sb doesn't save the old filename because are selected Server File Name.

It should use the file name specified as the "default file name" in the server behavior. Set that to the current field in the database and it will remain if no file is updated.

Thankyou, after update to DFP 2.0.1 all works fine also win ADDT active.