Web Reference: Feb 14, 2017 · You forgot to pass album name parameter in load_album method. That's why album_name parameter is assigned the actual callback, while callback parameter remains undefined. Most asynchronous methods that accept a callback function will accept an Error object passed as the first argument to that function. If that first argument is not null and is an instance of Error, then an error occurred that should be handled. One common error is the TypeError: callback is not a function. In this post, we'll explore why this error occurs and how to solve it efficiently, using a practical example.
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