I have printer canon mx 320 and it showing continuously error code-6000

1. Here is a link to get the owner manual:
Canon U.S.A. : Support & Drivers : PIXMA MX320 (http://usa.canon.com/cusa/support/consumer/printers_multifunction/pixma_mx_series/pixma_mx320#BrochuresAndManuals)

2. I'm not finding that error code in the manual, but other websites say that it is a hardware issue possibly from a previous paper jam.

Something is broken or jammed inside.

Open it up to be sure there are no scraps of paper jamming it. If that does not fix it, call Canon; they should be able to walk you through other troubleshooting steps - or replace the printer if it is still under their warranty.