Cannot find protocol declaration for 'MFMailComposeViewControllerDelegate'; did you mean 'UIPageViewControllerDelegate'?

This code :

#import <UIKit/UIKit.h>
#import <MapKit/MapKit.h>
#import <MessageUI/MessageUI.h>
#import "MessageComposerViewController.h"
#import <MessageUI/MFMailComposeViewController.h>

@interface MapViewController : UIViewController <MFMailComposeViewControllerDelegate> // Add the delegate

- (IBAction)showEmail:(id)sender;

{
    IBOutlet MKMapView *mapView;
}

@property (nonatomic, retain) MKMapView *mapView;

@end

This problem or error :

• Cannot find protocol declaration for 'MFMailComposeViewControllerDelegate'; did you mean 'UIPageViewControllerDelegate'? for this lign : #import "MessageComposerViewController.h"

• Expected identifier or '(' for this lign : @interface MapViewController : UIViewController // Add the delegate and this lign : {

Thanks for advance. :)