I did /ban @username and nothing happened, then I looked in the console and saw the error below.
Same happens with /mute @uername
app.js:2400 Uncaught TypeError: MP.showBanModal is not a function
at Object.exec (app.js:2400)
at Object.sendMessage (app.js:2680)
at HTMLInputElement.<anonymous> (app.js:5792)
at HTMLInputElement.dispatch (jquery.min.js:3)
at HTMLInputElement.r.handle (jquery.min.js:3)
I did
/ban @username
and nothing happened, then I looked in the console and saw the error below. Same happens with/mute @uername