Not compatible with ManageWP

[this topic has also been posted as an issue on GitHub here: https://github.com/Rahe/Simple-image-sizes/issues/41]

Hi there,

Firstly, thanks for providing such a great plugin to the WP community!

I think I’ve discovered a bug. As I started using ManageWP I found that one of my websites couldn’t sync and after going back and fourth with the support team at ManageWP we found out that the issue had to do with the Simple Image Sizes plugin. Here’s the error message I got from ManageWP:

Class 'SIS_Admin_Main' not found occurred in wp-content/plugins/simple-image-sizes/simple_image_sizes.php on line 56. Please make sure that your website is accessible.

You might not find it important to have the plugin compatible with ManageWP, and fair enough if so, but I just thought I would flag it here as it seems a shame to not be able to use these two great tools in the same time (all other plugins I’ve installed throughout my 15+ sites have no problems syncing).

I would certainly contribute with a solution to this myself, if only I had the knowledge to do so.

FYI. I’m using Simple Image Sizes on a multisite installation – not sure if that’s in any way relevant.

Many thanks.