make the late binding early binding

I know the benefit of late binding is dynamically bind the components. But the disadvantage is slowness. So I create interfere for my component

Using late binding way in .NET in equivalent as early binding


But I face the following error while running the following statement. Please support me of this: -

oTest = CType(Activator.CreateInstance(objType), AIC.INCBCOM)

Note : otest defend as interface not object
AIC.INCBCOM is the interface
The Error is

Not specified Cast

Regards