Add Subject Here

Your validator is erroring on the following meta name types saying that they "are not registered"
Alexa
Classification
sitetitle
pagerank(tm)
revisit
serps
subject
seoconsultansdirectory

These should be passing the validator.  I saw a note on your validation page link that I can manually add them, however, you don't say how or provide a link to do so.

NOTE: Whenever possible, give the address of the document you were checking..