When printing to some Epson printers from Help Viewer, an alert box appears with a Type 1, 2, or 11 error message, or Help Viewer unexpectedly quits. After clicking OK (if an alert box appears with that option) or after restarting the computer, the print job usually prints.
Solution
Download and install the Mac OS 9.1 update available from http://www.apple.com/swupdates/