RemoteMethodServer.invoke() called on default method server from within method server

Error message "RemoteMethodServer.invoke() called on default method server from within method server! Bad loopback code!" is displayed in MethodServer.log during part creation.

Need a suggestion, to fix this Error message.
I've attached the code snippet below for the reference, so pelase check it.

Code Snippet:

java.util.Iterator<CustomClassificationBean> iterator = getBean.iterator();
while(iterator.hasNext()){
CustomClassificationBean partBean = (CustomClassificationBean)iterator.next();
userName = partBean.getUserName();

}catch(Exception e){
e.printStackTrace();
}

RemoteMethodServer remoteMethodServer = null;
GatewayAuthenticator auth = null;
Class[] argTypes = new Class[]{java.util.Vector.class};
Object[] argList = new Object[]{getBean};

auth= new GatewayAuthenticator();
remoteMethodServer = RemoteMethodServer.getDefault();
auth.setRemoteUser(userName);
remoteMethodServer.setAuthenticator(auth);
remoteMethodServer.setUserName(userName);
responseData =(String) remoteMethodServer.invoke("createPart", "com.test.customService", null, argTypes, argList);