I added "cart" to the URL - in the dbts processor - republished the dbts functions - all files in dbts. Also re-published the page which contains the form. I still get an error

The requested URL /cart/req_form_thanks_.php was not found on this server.
Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.
I must be blind! It has to be something simple!
EDIT - - - Should have included - the form is on the "About" page
EDIT 2 - - - OK, so I tried to
change the file name - no go
select "use built in processor" - from form properties page - nope
each time I changed something that did not work I 'undid' changes. BUT - I have missed something now - - when I fill out the form & hit submit - I get an 'internal error' "The entered code was wrong" and a hyper link "go back"
OH BOY! I've made a mess!
