Need Help Rendering Glass Vray


I have problem with rendering glass material.I use 3ds max Design 2015 for architecture and have been following this tutorial “Digital Tutors - Modeling Impressive Architectural Exteriors in 3ds Max and V-Ray” , and i got stuck with glass and water vray material, when assigned to the material it shows in the viewport that its transluscent but when rendered nothing happened its just a plane shade . I checked many tutorials for this , couldnt find a sollution ,could it be overide material problem? plus i dont have much time since i have to finish and send project to a client.
Please if someone can fix this problem for me.
I have attached images
Thank you