Canon LBP7110Cw Manual page 489

Load paper that matches the paper size setting, or change the paper size setting to match the paper.
Solution "Loading Paper"
"Registering the Paper Size and Type"
<Cause 5> When printing the following paper, the paper is loaded with an orientation (feed
direction) that differs from that of the paper drawer or the paper setting for the job.
A5 paper
Statement paper
Custom size paper with a width and length (height) between 127.0 and 215.9 mm
Load paper with the orientation (feed direction) that matches the paper setting, or change the setting of
the paper feed direction to match the paper.
Solution
"Loading Paper"
"Registering the Paper Size and Type"
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