Objective-c: Open URL in WebView (Mac)

I'm having a problem with opening a URL in WebView. Haven't programed with objective-c in awhile and it looks like what I'm coding has depreciated. The application opens, loads the URL but crashes with this error

Thread 1:EXC_BAD_ACCESS (code=1, address=0x20)

I originally used this to help me program in the past: [How to load URL on launch in a WebView (OSX project)?

Here's the code:

AppDelegate.h

#import <Cocoa/Cocoa.h>
#import <WebKit/WebKit.h>

@interface AppDelegate : NSObject <NSApplicationDelegate> {
    WebView *myWebView;
}

@property

(retain, nonatomic) IBOutlet WebView *myWebView;


@end

AppDelegate.m

#import "AppDelegate.h"
#import <WebKit/WebKit.h>

@implementation AppDelegate

- (void)applicationDidFinishLaunching:(NSNotification *)aNotification
{
    NSString *urlText = @"http://google.com";
    [[self.myWebView mainFrame] loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:urlText]]];
    return;
    // Insert code here to initialize your application
}

@end

I receive a warning in AppDelegate.m before I build

Autosynthesized property 'myWebView' will use synthesized instance variable '_myWebView', not existing instance variable 'myWebView'

How can I fix this?