Epson AcuLaser C9100 Reference Manual page 301

Check Transparency
You have loaded media other than transparencies when the Paper
Type setting in the printer driver is Transparency, or
transparencies are loaded when the Paper Setting in the printer
driver is not set to Transparency. Paper is jammed at the MP tray.
Remove the paper from the MP tray and remove the jammed
paper from the MP tray. Open and close cover B to clear the
message on the LCD panel, then reload the paper. The printer
resumes printing from the page that jammed.
Collate Disabled
Printing by specifying the number of copies is no longer possible
due to a lack of memory (RAM) or free disk space on the optional
Hard Disk Drive. If this error occurs, print only one copy at a time.
To clear this error, select
Reset Menu. For instruction about accessing the control panel
menus, see "How to access the control panel menus" on page 338.
Duplex Mem Overflow
There is not enough memory for duplex printing. The printer
prints only on the front and ejects the paper. To clear this error,
follow the instructions below.
If is selected as the Auto Cont setting on the control panel's
Setup Menu, press the N Start/Stop button to print on the back of
the next sheet, or press the + Cancel Job button to cancel the print
job.
If is selected as the Auto Cont setting on the control panel's
Setup Menu, printing continues automatically after a certain
period of time.
from the control panel's
Troubleshooting
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