com.google.api.gax.grpc.ApiException: io.grpc.StatusRuntimeException: DEADLINE_EXCEEDED - google-cloud-vision

Question

Recently,I use google cloud vision api for detecting image label ,follow this
,I set up the credentials for my application to authenticate its identity to the service and obtain authorization to perform task,then follow the API Documentation ,write code like this:
ImageAnnotatorClient vision= ImageAnnotatorClient.create();
ByteString imgBytes = ByteString.readFrom(new FileInputStream("my_image_path.jpg"));
List<AnnotateImageRequest> requests = new ArrayList<AnnotateImageRequest>();
Image img = Image.newBuilder().setContent(imgBytes).build();
Feature feat = Feature.newBuilder().setType(Type.LABEL_DETECTION).build();
AnnotateImageRequest request = AnnotateImageRequest.newBuilder()
.addFeatures(feat)
.setImage(img)
.build();
requests.add(request);
BatchAnnotateImagesResponse response = vision.batchAnnotateImages(requests);
List<AnnotateImageResponse> responses = response.getResponsesList();
for (AnnotateImageResponse res : responses) {
if (res.hasError()) {
System.out.printf("Error: %s\n", res.getError().getMessage());
return;
}
for (EntityAnnotation annotation : res.getLabelAnnotationsList()) {
annotation.getAllFields().forEach((k, v)->System.out.printf("%s : %s\n", k, v.toString()));
}
}
I get error :
Exception in thread "main" com.google.api.gax.grpc.ApiException: io.grpc.StatusRuntimeException: DEADLINE_EXCEEDED
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$6.run(Futures.java:1310)
at com.google.common.util.concurrent.MoreExecutors$DirectExecutor.execute(MoreExecutors.java:457)
at com.google.common.util.concurrent.ExecutionList.executeListener(ExecutionList.java:156)
at com.google.common.util.concurrent.ExecutionList.execute(ExecutionList.java:145)
at com.google.common.util.concurrent.AbstractFuture.setException(AbstractFuture.java:202)
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: DEADLINE_EXCEEDED
at io.grpc.Status.asRuntimeException(Status.java:545)
... 13 more
why?