Canon PRO-100S series Online Manual page 534

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Cause
Possible causes include the following.
• There is no paper in the rear tray.
• Paper is not loaded properly.
Action
Take the corresponding actions below.
• Load paper in the rear tray.
• Align the paper guides with the both edges of the paper when you load paper.
After carrying out the above measures, press the printer's RESUME/CANCEL button to dismiss the error.
Important
• Be sure to close the feed slot cover after loading paper in the rear tray. If the feed slot cover is open,
paper cannot be fed.
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