PayPal Express is not able to support checkout in Rupees. If you are wishing to accept in Rupees you will need to switch to another gatway, I would look into Citrus Payments: http://www.citruspay.com/
The other option if you are wishing to use PayPal is to change the currency you accept in. If you have questions about which currencies are available you can contact PayPal directly: 1-866-358-0103
Hope that helps!