Here you can find some details on fixing common issues.
This error occurs if TweetShift cannot create a webhook in your chosen channel due to a permission error. Even if you give the 'TweetShift' role the 'Manage Webhooks' permission, overlapping roles may mean that TweetShift still cannot create webhooks, for this reason, we recommend that most people who aren't savvy with roles just give the 'TweetShift' role 'Administrator' permissions. Below is a video which shows how you can enable this permission on the correct role.
If you recieve this error, it means the server owner hasn't given you the correct permissions in order to use our commands relating to Twitter feeds. You need the 'Manage Webhooks' permission, for the whole server, in order to manage Twitter feeds. Below is a video which shows how you can enable this permission on a role.