Try one or more of the following:
The user ID and password used to authenticate to the printer are case-sensitive.
If the user is printing through an FTP or Port 9100, then clear Restrict non-authenticated printing in Application Settings in the administrator home screen.
Nearing, reaching, or exceeding the quota may restrict the user from printing. Configure the user quota from User Accounts in the administrator home screen. For more information, see Managing individual users.
The user may not have an internal account that is allowed to access the printer. For more information on adding a user, see Managing individual users.
Use the default PostScript print driver that came with the printer or the Universal Print Driver.
Enable Job Accounting before using the application. For more information, see the Print Driver Help. If your print driver does not support Job Accounting, then download the Universal Print Driver from http://support.lexmark.com.