Pentax Optio M20 Operating Manual page 174

Data being processed
Messages such as the following may appear on the LCD monitor when
using the PictBridge function.
No paper in the printer
No ink in the printer
Printer error
Data error
Paper stuck in the
printer
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This message appears when the camera takes more than
five seconds to display an image due to image processing,
or when the SD Memory Card or built-in memory is being
formatted.
There is no paper in the printer.
There is no ink in the printer.
An error message has been sent from the printer.
A data error message has been sent from the printer.
The paper is stuck in the printer.