JavaScript error with Debug on when using Custom Post Type UI Plugin

Hi there, I recently installed your plugin and with WP_DEBUG on, I get a JavaScript error in the debug bar when I drag one of my Custom Post Type posts.

Uncaught SyntaxError: Unexpected token <
http://swimtopianew.wpengine.com/wp-admin/edit.php?post_type=feature line 1

I also submitted this to the CPT UI Forum because I’m not certain where the error lies.

Thanks!

https://ww.wp.xz.cn/plugins/simple-page-ordering/