UIAlertView title set sending "SIGABRT"

I'm new to Cocoa Touch and I'm just messing around trying to get a feel for the language and framework. So I'm just trying to create a simple app that takes text from a UITextField and just shows it in a UIAlertView here is the action method:

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- (IBAction)showNotifAction:(id)sender {
    putVal = _TextToDisplay.text;
    _alertOne.title = @"Message";
    _alertOne.message = putVal;
    [_alertOne show];
}

For some reason it breaks on line 3 with a SIGART. Is there something I'm doing wrong? Oh, BTW, here is my AppDelegate implementation:

@interface LearnAppDelegate : NSObject <UIApplicationDelegate> {
    UITextField *_TextToDisplay;
    UIButton *_ShowNotif;    
    UIAlertView *_alertOne;
    NSString *putVal;
}

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You need to define your UIAlertVIew. Pointer that you are trying to use points to nothing or to garbaged memory.

Try something like the following code:

    UIAlertView *alert = [[[UIAlertView alloc] initWithTitle:"My title" 
message:putVal
delegate:nil 
cancelButtonTitle:@"OK" 
otherButtonTitles:nil] autorelease];
    [alert show];