PIXMA PRO-300 Support Code 1062 when printing Avery labels

[BevSDC]

I'm using a MacBook Pro and trying to print Pages file to Avery labels (1" x 2-5/8" Rectangle Tables UltraDuty White Film for Inkjet) onto my Canon Pro-300 printer. When I print the file onto plain letter paper it works fine but when I put in the Avery labels and try to print it get the Support Code 1062 (Cannot print. The paper widths do not match....). I turned off detect paper width but still get the error message. How do I fix this???