The server refuses a request to start a client session because the client node name is not registered as a node of TYPE=CLIENT. This node name is already in use either as a server definition as defined by a DEFINE SERVER command or else as a node of TYPE=SERVER using the REGISTER NODE command.
Server operation continues.
Issue a QUERY NODE TYPE=SERVER or a QUERY SERVER to determine which server definition already is using this node name. This client should be registered using the REGISTER NODE TYPE=CLIENT command and specify a name that is not in use by any other nodes or server defined to this server.