Google语音API抛出无效的音频通道数

对于Mac机上录制的音频，Google Speech API会引发无效的音频通道计数异常。

我只是在使用Google提供的示例应用程序。

com.google.api.gax.grpc.ApiException: io.grpc.StatusRuntimeException: INVALID_ARGUMENT: Invalid audio channel count
    at com.google.api.gax.grpc.ExceptionTransformingCallable$ExceptionTransformingFuture.onFailure(ExceptionTransformingCallable.java:109)
    at com.google.api.gax.core.ApiFutures$1.onFailure(ApiFutures.java:52)
    at com.google.common.util.concurrent.Futures$6.run(Futures.java:1764)
    at com.google.common.util.concurrent.MoreExecutors$DirectExecutor.execute(MoreExecutors.java:456)
    at com.google.common.util.concurrent.AbstractFuture.executeListener(AbstractFuture.java:817)
    at com.google.common.util.concurrent.AbstractFuture.complete(AbstractFuture.java:753)
    at com.google.common.util.concurrent.AbstractFuture.setException(AbstractFuture.java:634)
    at io.grpc.stub.ClientCalls$GrpcFuture.setException(ClientCalls.java:466)
    at io.grpc.stub.ClientCalls$UnaryStreamToFuture.onClose(ClientCalls.java:442)
    at io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl.close(ClientCallImpl.java:481)
    at io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl.access$600(ClientCallImpl.java:398)
    at io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl$1StreamClosed.runInContext(ClientCallImpl.java:513)
    at io.grpc.internal.ContextRunnable.run(ContextRunnable.java:52)
    at io.grpc.internal.SerializingExecutor$TaskRunner.run(SerializingExecutor.java:154)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)
Caused by: io.grpc.StatusRuntimeException: INVALID_ARGUMENT: Invalid audio channel count
    at io.grpc.Status.asRuntimeException(Status.java:545)
    ... 13 more

这需要任何特殊的配置吗？

这个错误是什么意思？