Thank you, Chuck S.
This is an observation -
When I try to upload the photo into an assigned category, I received the error message and when I click to submit the photo, a 'no thumbnail' shows up.
see:
TDS Layouts Gallery - Main Index
When I click on the 'no thumbnail' banner, I can see the photo that I have uploaded.
Does this observation help to locate where the error is?
The error only shows up when I try to place the photo into a category. I have no problem when I upload into the default member gallery.
Alice