Getting error code 1012 during user registration

hi, following exception is recoded in error logs when customer try to register, can any explain what is about and suggestion for solution.

„culprit“:„POST /user/registration“,„environment“:„production“,„exception“:{„values“:[{„type“:„AuthenticationServiceException“,„value“:„Registering user failed for ajay@yahoo.de Error code: 1012“,„module“:„org.springframework.security.authentication“