Canon MB2100 SERIES Online Manual page 1193

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Cause
Possible causes include the following.
• There is no paper in the cassette.
• Paper is not loaded in the cassette properly.
What to Do
Take the corresponding actions below.
• Load paper in the cassette.
• Align the paper guides with the both edges of the paper when you load paper in the cassette.
After carrying out the above measures, press the OK button.
Note
• To cancel printing, press the printer's Stop button.
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