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[HP Laserjet pro mfp m521dn] if anyone knows about a code error 6 please contact me

I have an HP Laserjet Pro mfp m521 and whenever I start it up, it checks the scanner and tells me there's an error. Code given is 6, but no matter how hard I try I never found this error code, as far as I know it doesn't exist. Most other people's solutions to fix the scanner relies on the thing...