Error message "auto duplexer is not installed" after a paper jam was removed on my epson artisan 837.
I print from a Macbook Pro (April '09) OSX 10.9.3 to an Epson Artisan 837 duplex all-in-one which has been functioning perfectly for some time. The other day while duplex printing I got a vague error message to the effect "printer error, turn off machine and power back on." I repeated that process several times waiting a period of time and/or doing it speedily. I even unplugged the printer from its outlet, turned off the computer, waited overnight and tried again, all to no avail. I then found the back tray had a paper jam which I removed and replaced the tray. Since this ordeal I have NOT been able to use the duplex function. After apple's air-print, an Epson Customer Service person told me to add a printer in Systems, printer preferences and to simply add in the same printer (only one i have) but choose not to have it be air-print. This worked even though it gave me Epson Artisan 837 and Epson Artisan 837II (the first with air-print the second not). I must be missing some step this time, however, because although I now have essentially 2 printer choices, the Epson II has duplex printing choices grayed out and gives me the error message "auto duplexer is not installed." Sorry to make this so long, but can anyone help me with this problem?