How to set manual crop to be compulsory for image? I searched a lot for this problem but not getting any solution.
Any help is very appreciate.

I am using Manual Crop (7.x-1.5) module for cropping the images. 
But problem is that I want to set cropping to be compulsory for image. I did not find any option in manual crop setting to set it as required.
I resolved my problem by using hook_node_validate.