Issue on call iphone native audio record plugin unity

First am using record by the help of native code plugin(.a) to record voice and save as mp3 up to that works fine.After am plan to integrate video camera recording with audio using Following code,

 audioSource.clip = Microphone.Start(Microphone, true, 10, 44100); 
 
  audioSource.Play();

And than end after some time

here lead a problem Application will crash while load native plugin am get following error type

NSInvalidArgumentException:outputSettings:sourceFormatHint . Even error will display after am stop first audio service and star second service.Thanks for your help