Ok, this is a very simple problem: when you run the ndadmin.php and you filled in your form URL, you typed in: http://www.networkprofit.net/f36salesp2

that is you forgot the .html at the end.
So the script sees that the submission is made by http://www.networkprofit.net/f36salesp2.html

but in it's archive it expects the submission from http://www.networkprofit.net/f36salesp2

so it considers it an illegal submission.

Run again ndadmin.php typing correctly the form URLand you will be ok.

Also, you have an unnamed hidden field in your form which does nothing.

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