Error with new theme

Fatal error: Cannot redeclare widget_supporter_badge() (previously declared in /home/fowi/public_html/wp-content/mu-plugins/widget-supporter-badge.php:47) in /home/fowi/public_html/wp-content/mu-plugins/widget-supporter-badge.php on line 47

I am attempting to install a new theme for a client. The theme is “Tesla” which I purchased off of ThemeForest. When I go to activate I get the above error message. The widget-supporter-badge is not used on this site.

It doesn’t happen on the current theme so it could be theme related. I am posting a question for the theme developer also. But I was hoping you guys might have an idea where I can start troubleshooting.