Incorrect Code Format

When I first installed this plugin, I came across an error of an unexpected $end to the script.

I investigated, and all of the opening <? tags didn’t have this: <?php

You should update this. I made the updates myself, but all of these tags should have this.

Also, your Zen Planner image link in the admin is broken.

http://ww.wp.xz.cn/extend/plugins/zenplanner/