DataSource TestStep Icon is disabled in SOAPUI 3.5.1

Hi,

I have installed SOAPUI 3.5.1 in my machine.

But not able create an new SoupUI Pro DataSource new Teststep.

If i click on the icon of datasource, it is asking for new name with default one as "soapUI Pro DataSource" but after clicking "Ok" it does not add a DataSoruce TestStep.
I need to have excel sheet as external input for the test case.

Please let know whether it is related to the version issue or anything else needs to done for this.
Please clarify this.

Thanks,
Chinnu Subramaniam