object - objective-c 2.0 Duplicate interface definition for class when defining private methods -


i try define simple private methods , properties in class gives me:

duplicate interface definition class 'fbviewcontroller'

this .m file :

#import "fbappdelegate.h" #import "fbviewcontroller.h" #import<facebooksdk/facebooksdk.h> #import "fbloginviewcontroller.h"     @interface fbappdelegate()         @property (strong,nonatomic) uinavigationcontroller *navcontroller;         @property (strong, nonatomic) fbviewcontroller *maincontroller;         -(void) showloginview;     @end       @implementation fbappdelegate     @synthesize navcontroller = _navcontroller,     maincontroller =_maincontroller;      ...     ...      @end

and *.h file:

#import <uikit/uikit.h>    @interface fbappdelegate : uiresponder <uiapplicationdelegate>  @property (strong, nonatomic) uiwindow *window;  @end

update
added import files

*solved *
in facebooksdk there fbviewcontroller.h already

the error getting 

duplicate interface definition class 'fbviewcontroller'

and looking class called fbappdelegate. try reading error message again, may help.


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