Hello,
Welcome to fixya.
Try this link of my solution for this issue...it is very common and locating the filter is part of the remedy for these faults so it should serve helpful for you too.
http://www.fixya.com/support/t7367730-f_21_error_displayed
Let me know how it goes and if you require further assistance.
Thanks for choosing fixya. Please take a moment to rate the solution provided for you here today.
Good luck.
Regards,
Macmarkus :)
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