as an object that you can call a method on without giving the method name. What you do pass it is ",movieFile" which is not a valid method call.
I think what you are trying to do is us
Code:
"%@"
as a format string and have movieFile be the argument to that format. But your code is nothing even close to that: look at the stringWithFormat: method in NSString and use it.
You still have a meaningless set of square brackets around the result that the compiler will try and turn into a method call and fail.
I suggest you take two steps back and read up on the basics of Objective-C before trying to write any code as it's clearly you fundamentally don't understand what you are doing.