An error was encountered loading the media URL
Using Jamroom
There is an event that happens when that message shows "An error was encountered loading the media URL", the event is 'stream_url_error'.
One solution could be to build a module that listens for that event and when it happens the audio file that was trying to be streamed gets flagged with a tag like audio_stream_error = 1.
Then in your playlist you could filter out any audio files that have been tagged as bad.
{jrCore_media_player type="jrAudioPro2_playlist_player" module="jrAudio" field="audio_file" search1="audio_stream_error != 1" limit="50"}The real issue is that you have bad audio files, this would help locate those so you can get rid of them.