Неопознанный селектор создания класса

Я изучаю Objective-C. Я собираюсь создать простой класс, но при компиляции после ожидаемого результата я получаю эти ошибки.

2014-05-08 10:15:47.998 ClassCreation[978:903] This is a method call in the new object!
2014-05-08 10:15:48.007 ClassCreation[978:903] -[Employee setName:]: unrecognized selector sent to instance 0x10010c850
...
terminate called after throwing an instance of 'NSException'
(gdb) 

Вот это Employee.h

#import <Foundation/Foundation.h>
@interface Employee : NSObject

// properties
@property NSString *name;
@property NSDate *hireDate;
@property int employeeNumber;

-(void) someMethod;

@end

Вот это Employee.m

#import "Employee.h"

@implementation Employee

// matching the method definition that is defined in the interface
-(void) someMethod {
NSLog(@"This is a method call in the new object!");
}

@end

Вот оно основное.м

#import <Foundation/Foundation.h>
#import "Employee.h"

int main (int argc, const char * argv[])
{

@autoreleasepool {

    //  inside here, I instantiate a new object of my new employee class
    Employee *fred = [[Employee alloc] init];

    // call a method of our new object
    [fred someMethod];

    // change a property of new object
    [fred setName:@"Fred Smith"];

}
return 0;
}

Я на 10.6.8 с Xcode 4.2