Lexmark e332n error code does not exist in the manual

Hello,
It seems that I have a blinking message in the printer that is not in the manual.
The Ready light is on
The Toner Low light is blinking

I searched in the manual
http://www.lexmark.com/publications/pdfs/e330/eng/ug.pdf
but this error code does not exist.
Can you help me?
Thanks.