Canon iPF8300S User Manual page 1119

Paper has been loaded askew, or warped paper has been loaded.
Because the Platen is soiled with ink or other substances, the size
of the clear film cannot be detected.
iPF8300S
Cause
Error Message > Messages regarding paper
Corrective Action
Printing will resume, starting from the page
on which the error occurred.
(See "Loading Sheets in the Printer.")
→P.813
Open the Top Cover and clean the entire Platen.
(See "Cleaning Inside the Top Cover.")
→P.1040
Paper size not detected.
>
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