'login' registered, but provider not found

I have Keycloak running but the file /opt/keycloak/standalone/log/server.log contains lots of errors:
2020-09-23 13:33:09,184 ERROR [org.keycloak.events.EventBuilder] (default task-684) Event listener ‘identity_provider_first_login’ registered, but provider not found
2020-09-23 13:33:09,184 ERROR [org.keycloak.events.EventBuilder] (default task-684) Event listener ‘login’ registered, but provider not found
However, while the login-procedure with 2FA works as expected, I am not happy with it; it are no WARNINGS but real ERRORS. Does anyone know how to solve this? Thanks in advance.

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any answers, and how you solved this, please?