Hello! Thank you for this great plugin!
I purchised a personal license, and I installed PRO plugin on a test website, just for test all features.
Everything works fine!
Now I’m going to install plugin to real live website  in internet (http://cooks.kz)
and I see the error:

WP User Frontend Error: Pleae activate your copy

I used the real license key from your email.
Please, help me.
Alex