First, check to see that you have enabled some coins in the CoinPayments adapter settings.
Then check to see if your coin adapter is is a state of “Responding”. To check, go to Wallets -> Adapters. There should be some entries with “Responding” status.
If the CoinPayments adapter is responding, and you have enabled some coins, and you still see this error, then there are two possibilities:
1. If you only followed the video tutorial and not the article, then read the warning at the top of the article about the get_callback_address permission. The same warning is under the video. You also need to assign this capability that’s not mentioned in the video.