奇怪的图像视图错误

Question

我已经创建了UIView的子类，并且在init方法中我有这个代码会产生错误

_blackBackground = [[UIView alloc] initWithFrame:self.frame];
    _blackBackground.backgroundColor = [UIColor blackColor];
    [_blackBackground setAlpha:0];
    [self addSubview:_blackBackground];
 NSLog(@"1");
    _window = [[UIImageView alloc] initWithFrame:CGRectMake(512 - 250, 768 + 50, 500, 650)]; // just below the screen by 50px
    NSLog(@"2");
    [_window setImage:[UIImage imageNamed:@"Buy Window Background.png"]];
    NSLog(@"3");
    [self addSubview:_window]; //error on this line
    NSLog(@"4");

错误说：

* 由于未捕获的异常'NSInvalidArgumentException'而终止应用程序，原因：' - [UIImageView _subtreeMonitorsForView：]：无法识别的选择器发送到实例0x7db5f60'

我已经检查了图片标题名称是否正确