Expected Specifier qualifier list error

Hey guys, I know this problem caused due to the absent of importing header

But in my case, I've included the header but I still got the error?! What happens?

#import <Foundation/Foundation.h>
#import "WikitudeA开发者_JAVA百科RCustomMenuButtonDelegate.h"
#import "DetailedARViewController.h"

@interface CustomMenuButtonDelegateImpl1 : NSObject <WikitudeARCustomMenuButtonDelegate> 
{
    DetailedARViewController *ARViewController;

}


@end

Make sure that "DetailedARViewController.h" really does define DetailedARViewController; in particular, check for subtle errors like misspellings or a declaration accidentally commented out.