I figured out why I was having the issue, but I'm not quite sure how to solve it or what file I can make an exception to the rule with.
Your plugin works fine when I don't have a .htaccess file in ./wp-content/.htaccess
My htaccess has the contents:
Order deny,allow Deny from all <Files ~ ".(xml|css|jpe?g|png|gif|js)$"> Allow from all </Files> # directory browsing Options All -Indexes
So when I upload this to my wp-content directory, then I start getting that error. Do you know what I can do to keep this protection, but still have crayon syntax highlighter still work?