My site messed up with the stupid plugin

I had installed one security plugin but my site went slow, so i remove it from filezilla, that is mistake i have done, without deactivated and deleted the plugin from admin, i directly removed the plugin from ftp client, now my site has messed up. I tried to clean the cache, done everything but still the same issue, i don’t know what is opening here… Please help..

Screenshot – https://gyazo.com/71aa299138ff576f47752c73a8dd5f6c

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