Class creation unrecognized selector - objective-c

Question

I'm learning Objective-C.
I'm at the point of creating a simple class but when compiling, after the expected result, I get this errors.
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)
Here it is the Employee.h
#import <Foundation/Foundation.h>
#interface Employee : NSObject
// properties
#property NSString *name;
#property NSDate *hireDate;
#property int employeeNumber;
-(void) someMethod;
#end
Here it is the 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
Here it is the main.m
#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;
}
I'm on 10.6.8 with Xcode 4.2

Answer 1

With XCode 4.2 you need to add the line
#synthesize name,hireDate,employeeNumber;
to your Employee.m file after the #implementation line
Auto synthesis of properties only became available with XCode 4.4 - http://useyourloaf.com/blog/2012/08/01/property-synthesis-with-xcode-4-dot-4.html
You should look at upgrading your XCode version