This error happen due to some reasons such you try to alter default user or creating a new user, so in order to fix this you need to change some configuration in cassandra.yaml file which is inside /conf folder
Change
authenticator: AllowAuthenticator
To
authenticator: PasswordAuthenticator
Then you need to restart your Cassandra server and that all!
Change
authenticator: AllowAuthenticator
To
authenticator: PasswordAuthenticator
Then you need to restart your Cassandra server and that all!
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