"Log in" not working anymore

It was a great app and I also used some extra features but since the last 3 weeks I cant use it anymore. Every time I try to log in it says
{"code": 400, "error_type": "OAuthException", "error_message": "Client Disabled"}
To make sure it wasnt an issue about my device or my Instagram account I have downloaded the app on a different device and tried to use it signing in with a different Instagram account but I still have the same problem.
Would be great if you can fix it ASAP and make the app working again. Thanks.

An.Ba about My Followers for Instagram (B), v2.3.1