SOAP UI unable to connect with GT Data Pro

Hi,

I am getting the below error while running test case from SOAP UI Pro 3.0.2. But few days back this was working fine. Can you help me figure out this error.

TestCase failed [java.lang.Exception: Failed to prepare testStep [DataProSource]; java.lang.Exception: Failed to init connection for drvr [], connectionString []:java.lang.Exception: Failed to prepare testStep [DataProSource]; java.lang.Exception: Failed to init connection for drvr [], connectionString []], time taken = 0