Fatal Error: Blog gone

{Help}

I tried to install a Top Commenter Plugin and I got this error:

Fatal error: Cannot redeclare ns_substr_ellipse() (previously declared in /home/content/b/a/c/bacharchayah/html/wp-content/plugins/show_top_commentators.php:33) in /home/content/b/a/c/bacharchayah/html/wp-content/plugins/top-commentators-widget/topcommentators_widget.php on line 21

And my blog is gone! I can’t even log in to admin. What do I do?

my blog is located at https://delightfullearning.com {help please!}