My hp designjet 500 displays an error 21;10 and is asking me to call hp how can I fix this problem

Please help! My designjet 500 is displaying an error 21:10 how can I fix it?

This forum is focused on consumer level products.  For the Designjet you may have better results posting in the HP Designjet forum here.
Bob Headrick,  HP Expert
I am not an employee of HP, I am a volunteer posting here on my own time.
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