Null不是Object StoreKit

Question

我遵循了这个教程： https://fovea.cc/blog/index.php/3-steps-tutorial-for-phonegap-2x-in-app-purchase-on-ios/

但是列表没有渲染，我得到错误：

  

TypeError：null不是对象（评估＆＃39; el.innerHTML =＆＃34;应用内购买不可用。＆＃34;＆＃39;）

任何帮助非常感谢！

这是代码：

viewDidLoad
{ 
    let tap: UITapGestureRecognizer = UITapGestureRecognizer(target: self,     
    action: "dismissKeyboard")
        view.addGestureRecognizer(tap)
}

func dismissKeyboard()
{
    // Causes the view (or one of its embedded text fields) to resign the first responder status.
    view.endEditing(true)
}