After upgrading my mac to snow leopard, the printer fails to print. It does nothing except provide an error message.the message says ,
:/system/library/printers/libraries/printjobmgr/contents/macos/printjobmgr failed. Does anyone know what this means? Thanks

Check the printer manufactures website for a new driver if you find one install it then uninstall the existing printer and reinstall after you have installed the new driver. If you can not find anew driver delete and reinstall the printer again.
If none of this works you can reinstall the OS