Canon imagePROGRAF GP-4000 - Manual (Page 937)

4107
Cause
Possible causes include the following.
• Received print job for Roll 1 (Upper) while Roll 2 (Lower) is in use.
• Received print job for Roll 2 (Lower) while Roll 1 (Upper) is in use.
What to Do
Tap OK on the touch screen to dismiss the error.
Remove the printed matter, and then try again.
937