when I going to start the BIND and configure the master zone I got the error like this

"NDC command failed : rndc: connection to remote host closed This may indicate that the remote server is using an older version of the command protocol, this host is not authorized to connect, or the key is invalid."

I already run rndc-confgun for new rndc key then I edit the file rndc.conf file whit new genereted key but still it's displaying the same error.

Can anybody able to figure out what's the acctual problem.