invalidate document

I did a check of and had the html tidy turned on to show me
the correct code. I copied this code into a fresh file and saved it as
index.php then tried testing it by upload through the online test but it
says that it is not a document that is supported. How is this possible?
What did I do wrong?

Thom Dickey, Co Founder
Ample Green Foundation
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Received on Thursday, 10 March 2011 08:14:45 UTC