@danialdali I understand that you’re trying to migrate your free app to v2 using fly migrate-to-v2. The error message you’re encountering is due to the fact that Fly.io requires payment information to be added to your account, even for free applications, when upgrading to v2.
To resolve this issue, you’ll need to add a credit card to your account. You can do this by signing in to your Fly.io account and updating your payment information.