iphone - AVAudioPlayer initialization: error code -50 -

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I recently went into a problem that could not be discussed anywhere on the Internet - I started a AVAudioPlayer To run an audio file, and to get the following error: 

  error domain = NSOSStatusErrorDomain code = -50 "operation can not be completed. (OSStatus Error-50.)

As it is detected, I create an init method to create my NSURL mistake The resulting

NS URL object is not empty.

"OSStatus error - 50 "means paramErr , an old style Mac error code that shows bad parameters.


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