Ruined my website on the new version

I installed Stats Counter on my website, and it ruined everything. My dashboard menu is gone, my website is gone. I noticed the problem when I tried to activate it. You can go to my website: http://canis.lt/

I see the same thing on the dashboard, on top of the page. I managed to access the plugins, but the delete button leads to the same as my website is now…

I desperately need help!

https://wordpress.org/plugins/stats-counter/