Did you check and&or write this to the Superstar addon comments and/or contacted the addon dev?
http://www.esoui.com/downloads/info9....html#comments
And please provide some more info "what did you do as the error occured" as one cannot see it from the error message in all cases.
If an error occurs the addon is not workin anymore that's why this keybind and others won't work anymore.