Problems with permalinks

Hello!
I got this mistake. I read about it in FAQ but still don’t understand how can i fix it. I need my permalinks as it is now. I can not change it…

“Permlink Structure Error

A custom url or permalink structure is required for this plugin to work correctly. Please go to the Permalinks Options Page to configure your permalink.”

Thank you!

https://wordpress.org/plugins/wp-super-cache/