Swift class in ObjC Project : Receiver 'MySwiftClass' for class message is a forward declaration

Question

After spending a few hours to integrate swift files successfully to my Objective-C based iOS project, I face the next challenge now :

1. In one of my Objective-C class header (Say, MyObjCClass.h), I do the forward declaration for MySwiftClass.
2. In the respective .m file, I define an instance of MySwiftClass _swiftClassInstance.
3. In the init method of MyObjCClass, I try to instantiate it as follows :

_swiftClassInstance = [[MySwiftClass alloc] init];

When I compile the code, I get 2 errors:

• Receiver 'MySwiftClass' for class message is a forward declaration
• Receiver type 'MySwiftClass' for instance message is a forward declaration

I have already done following :

1. Imported MyProject-Swift.h in the MyObjCClass.m file.
2. Marked the swift class with @objc and open

So, what can be the reason for the issue?