Canon PRO-6000 Online Manual page 757

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Cause
Media information cannot be recognized because the printer media information is corrupt.
What to Do
Start the Media Configuration Tool, and then recover the media information.
Media Configuration Tool Guide (Windows)
Media Configuration Tool Guide (Mac OS)
To set the Media Configuration Tool to recovery mode, open the Media Configuration Tool, select this
device and then click OK.
Select and load the media information backup file.
If you do not have a media information backup file, contact a Canon customer service center.
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