Discord.js Bot Tutorial #9 | Custom Prefix

My code doesn't work. Error code: Cannot find module 'quick.db'

i got error db.set is not a function how to solve

(node:5398) UnhandledPromiseRejectionWarning: TypeError: Cannot read property '0' of undefined Help me

Thank! It helped me!

if you are wondering how to get the admin only to change the prefix, do this :

if(!message.author.hasPermission("ADMINISTRATOR")){
message.channel.send(" only admins can change my prefix);
}else{
(change prefix here)
}

edit: use !message.member.hasPermission ... not author (check the replies).

first