Configure SDM Settings for NWDS 7.1

Hi

I have created a small webdynpro application for JAVA in NWDS 7.1

I have registered my system by going to Windows -- Preference -- SAP AS JAVA -- Register SAP Instances

When I am trying to deploy my JAVA application its throwing an error

The host or port returned by the SAP System Registry is invalid:

I have seen my sdm is working fine bcoz I can deploy the application through NWDS 7.0

Can anyone help me out with this how can I deploy my webdynpro application in NWDS 7.1

Regards

JM