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Thread 1: Program received signal: “EXC_BAD_ACCESS”

Thread 1: Program received signal: “EXC_BAD_ACCESS”

Thread 1: Program received signal: “EXC_BAD_ACCESS”

(OP)
I just have a simple code to practice Object C..
I am not sure why I can this "WARNING"?
My code is below

#import <Foundation/Foundation.h>


@interface MyClass : NSObject {
@private
    NSDate *mdate;
}

@property (retain) NSDate *mdate;

@end
==================================

#import "MyClass.h"


@implementation MyClass

@synthesize mdate;

- (id)init
{
    self = [super init];
    if (self) {
        // Initialization code here.
        mdate = [[NSDate date] autorelease];
    }
    
    return self;
}

- (void)dealloc
{
    [super dealloc];
}

@end
=============================================


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

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

    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];

    MyClass *mclass = [[MyClass alloc]init];
    NSDate *myBirthday;
    NSDateFormatter *dateFormat = [[NSDateFormatter alloc]init];
    [dateFormat setDateFormat:@"yyyy/MM/dd"];
    myBirthday=[dateFormat dateFromString:@"1990/09/02"];
    
    [mclass setMdate:myBirthday];
    NSLog(@"My Birthday is %@",[mclass mdate]);
    // insert code here...
    NSLog(@"Hello, World!");

    [mclass release];
    //[dateFormat release];
    
    [pool drain];
    return 0;
}

and in [pool drain] -> i got the message after I ran.

I am really newbie on Object C. Could someone please explain what I missed?
I think this cause my memory management(?)  

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