The printer detected a media size different from what it was expecting. This is typically caused if two or more sheets stick together in the printer or if the tray is not properly adjusted.

1. If you are printing from tray 2, 3, or 4, verify that the three paper-size adjustments (length guide, width guide, size-selector switch) on the paper tray have been made correctly. Make sure the media is under the corner tabs.
2. After performing the actions above, press GO. The page containing the error will automatically be reprinted