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What does 2 question marks on my display mean?

I am trying to print from my ProBook 6460b to my HP Photosmart 2575 All in One. My display panel shows what appears to be two question marks. When I try to print it says there is an error but doesn't specify what the error might be. I cannot print.

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crwdns2889612:0crwdne2889612:0 0

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Has it ever worked?

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