Error when getting service facade : Service manager initialization failed I

Dear Friends,

we have created entities in CAS((nwds 7.0.1)) and deployed in J2ee.

During Testing:

when we right click on entity and click on test.

service Browser. is opening with two Buttons.

One Button it is " start with CAF source".

when we select this its throwing error

Error text:

Error when getting service facade : Service manager initialization failed Illegal argument exception: Unable to create javax.ejb.EJBObject. because of this we are unable to test the entity.

request to throw pointers to clear this error.

Answers will be rewared.

Regards

shekar chandra