Possible causes include the following.
• There is no paper in the manual feed tray.
• Paper is not loaded properly.
Take the corresponding actions below.
• Load a sheet of paper in the manual feed tray.
• Align the paper guides with the both edges of the paper when you load paper.
After carrying out the above measures, press the printer's RESUME/CANCEL button to dismiss the error.
• To continue printing from the manual feed tray, wait until printing is completed, then load the next