Hi Madesh Kumar, Snapchat is working on the issues and promised to roll out a new update on the Snapchat support, In the meantime, you can also try an alternative method to add lenses feature manually. I found this trick that worked for more users. I hope it will also help you!
Basically, this manual method also works on those incompatible devices to add lenses features. Snapchatters need to follow certain guide or code works in variable tab in application. Once you follow step by step instruction, there is no doubt on enabling new feature.
Checkout manual method from this link: http://mobilecomputingtoday.co.uk/806/snapchat-lenses-working-error-fixed-manually-apple-devices/