objective-c - 報錯訊息： "_AVAudioSessionCategoryAmbient", referenced from:

Question

報錯資訊如下：

Undefined symbols for architecture x86_64:
"_AVAudioSessionCategoryAmbient", referenced from:

  -[OALAudioSession updateFromAudioSessionCategory] in OALAudioSession.o
  -[OALAudioSession updateFromFlags] in OALAudioSession.o
  
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