Opus Encoder Error : Channel must be stereo or mono

Im getting an error when trying to initialize the Opus encoder class in Unity3d 5.6 beta versions. The code works flawlessly on 5.5 and 5.4. I have tried b7-b9 and none of them work. Here are the error details.

ArgumentOutOfRangeException: Must be Mono or Stereo Parameter name: numChannels POpusCodec.OpusEncoder..ctor (SamplingRate inputSamplingRateHz, Channels numChannels, Int32 bitrate, OpusApplicationType applicationType, Delay encoderDelay) (at Assets/Plugins/PhotonVoiceApi/Core/POpusCodec/OpusEncoder.cs:208) ExitGames.Client.Photon.Voice.LocalVoice..ctor (ExitGames.Client.Photon.Voice.VoiceClient voiceClient, Byte id, IAudioStreamBase audioStream, ExitGames.Client.Photon.Voice.VoiceInfo voiceInfo, Int32 channelId) (at Assets/Plugins/PhotonVoiceApi/Core/VoiceClient.cs:217) ExitGames.Client.Photon.Voice.LocalVoice`1[System.Single]..ctor (ExitGames.Client.Photon.Voice.VoiceClient voiceClient, Byte id, IAudioStream`1 audioStream, ExitGames.Client.Photon.Voice.VoiceInfo voiceInfo, Int32 channelId) (at Assets/Plugins/PhotonVoiceApi/Core/VoiceClient.cs:317) ExitGames.Client.Photon.Voice.LocalVoiceFloat..ctor (ExitGames.Client.Photon.Voice.VoiceClient voiceClient, Byte id, IAudioStream`1 audioStream, ExitGames.Client.Photon.Voice.VoiceInfo voiceInfo, Int32 channelId) (at Assets/Plugins/PhotonVoiceApi/Core/VoiceClient.cs:385) ExitGames.Client.Photon.Voice.VoiceClient.CreateLocalVoice (IAudioStreamBase audioStream, ExitGames.Client.Photon.Voice.VoiceInfo voiceInfo, Int32 channelId) (at Assets/Plugins/PhotonVoiceApi/Core/VoiceClient.cs:727) ExitGames.Client.Photon.Voice.LoadBalancingFrontend.CreateLocalVoice (IAudioStreamBase audioStream, ExitGames.Client.Photon.Voice.VoiceInfo voiceInfo) (at Assets/Plugins/PhotonVoiceApi/LoadBalancingFrontend.cs:152) PhotonVoiceNetwork.CreateLocalVoice (IAudioStreamFloat audioClip, ExitGames.Client.Photon.Voice.VoiceInfo voiceInfo) (at Assets/PUNVoice/Scripts/PhotonVoiceNetwork.cs:215) PhotonVoiceRecorder.Start () (at Assets/PUNVoice/Scripts/PhotonVoiceRecorder.cs:144)

Im quite sure this is a unity3d beta bug. But I really need a solution right now. How to fix this Please help.