Good morning Rahul,
Please log into SupportNet, search for TechNote MG521013 and follow the steps within. This will reset some of your Envionment variables to reflect the desired version (EE 7.9.2). Let us know whether that resolves the message you are getting.
Thanks Thomas Wilkinson.
Problem is solved now actually i cahnged the System variable wdir path to my local path but letter on i corrected it with local path;Mentor Path is also required so now the problem is solved
thanks for the support.