SSH command from orchestrator using SSH plug-in

I have generated the key pair and also registered the public key on host using the workflows in the SSH plugin. Now when I try to execute a ssh command from the workflow, I see the following error -

"Unable to execute command InternalError: SSH_MSG_DISCONNECT: 2 Too many authentication failures for root  (Workflow:Run SSH command / Execute SSH Command (item6)#16) (Workflow:Run SSH command / Execute SSH Command (item6)#33)

Also, the session gets created and I am able to see the SessionID.

Please help me fix this.