iOS pinterest integration authorization error

I want to integrate pinterest in iOS app. User should be able to pin image from app.

For it i have done setup according to below link. http://ift.tt/1OZrPAC

After login i m getting authorization error as shown in image.

Note :- I m testing app in simulator.

Can anybody help me to solve the issue?

I really appreciate if there is any better solution which works.

Thanks