We're going to learn how to give a permission to Green-bot.
Before starting, not that you can re-invite the bot to your server with the admin permissions to fix it ( You don't need to kick the bot ). If you don't want to do that, it doesn't matter.

1. Edit the permissions of the channel

Click on the edit button behind your voice channel
Then, click on permissions
Click on the "+" and add Green-bot
Scroll down and check "Speak" & "Connect"
Your problem may be fixed!
Not fixed? Join our support server and ask a moderator to do that for you!