objective-c - 报错信息： "_AVAudioSessionCategoryAmbient", referenced from:

Question

报错信息如下：

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

  -[OALAudioSession updateFromAudioSessionCategory] in OALAudioSession.o
  -[OALAudioSession updateFromFlags] in OALAudioSession.o
  
  ![图片描述][1]