User Restore not working

Hello!

I need some help to solve one problem. 

Recently I need use the plugin User Restore plugin in one platform. All was going fine, until the moment that I cleaned the cache. 

Now, I can't see the users that I need reset and this message appears to me:

I clicked in "Full cache refill", the system was slow and i went back to the same screen that i sent the image above.

Can you help me, please? 

Thanks =)