I have set up the Advanced Form Processor on my recipe sharing website, and it works fine for my recipe submit form:

http://www.joycesrecipes.com/submit.html

However, I am now trying to set up a form for submitting documents and photos using the file upload utility here:

http://www.joycesrecipes.com/picsubmit.html

With this one I get the following error: Illegal Form Submission

I have information in all the required fields, and the file to be uploaded is less than 200kb. Is there a simple answer to this problem? What have I missed?

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