Error saying the viewController does not exist.iOS Xcode

In my app, It is showing some error like :

 "unknown type name 'purchasedViewController'; DId you mean 'UIPageViewController'?

But actually there is a VC named purchasedViewController and i have imported it in the current VC.

But when i create an object of purchasedViewController in the current VC like:

@property(strong, nonatomic) purchasedViewController *purchasedController;

im getting an error message saying :

"unknown type name 'purchasedViewController'; DId you mean 'UIPageViewController'?

Why is it happening?Any idea?