swift - Error: Could not cast value of type NSKVONotifying_MKUserLocation to Park_View.AttractionAnnotation -

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when using func:

func mapview(mapview: mkmapview!, viewforannotation annotation: mkannotation!) -> mkannotationview! {     let annotationview = attractionannotationview(annotation: annotation, reuseidentifier: "attraction")     annotationview.canshowcallout = true     return annotationview }

this error occured:

could not cast value of type 'nskvonotifying_mkuserlocation' (0x7e8a62b0) 'park_view.attractionannotation' (0xf7948).

it working when try add corelocation find user location code start having error.

i found out mkuserlocation annotation too.

here solution came out , solve error.

func mapview(mapview: mkmapview!, viewforannotation annotation: mkannotation!) -> mkannotationview! {     if (annotation mkuserlocation) {         return nil     }     else {         let annotationview = attractionannotationview(annotation: annotation, reuseidentifier: "attraction")         annotationview.canshowcallout = true         return annotationview     } }

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