Should I sign up free trial for the google vision api?

• I have a problem when use Cloud Google Vision API reading a picture information.
• I receive the following error:

Cloud Vision API reuqest failed.Check logs for details.

• After debugging, I notice the code runs to the line: BatchAnnotateImagesResponse response = annotateRequest.execute(); then runs to line return "Cloud Vision API request failed. Check logs for details.";

  protected String doInBackground(Object... params) { try{

              HttpTransport httpTransport = AndroidHttp.newCompatibleTransport();
              JsonFactory jsonFactory = GsonFactory.getDefaultInstance();
  
              VisionRequestInitializer requestInitializer = new VisionRequestInitializer(CLOUD_VISION_API_KEY);
  
              Vision.Builder builder = new Vision.Builder(httpTransport, jsonFactory, null);
              builder.setVisionRequestInitializer(requestInitializer);
  
              Vision vision = builder.build();
  
              BatchAnnotateImagesRequest batchAnnotateImagesRequest = new BatchAnnotateImagesRequest();
              batchAnnotateImagesRequest.setRequests(annotateImageRequests);
  
              Vision.Images.Annotate annotateRequest = vision.images().annotate(batchAnnotateImagesRequest);
              annotateRequest.setDisableGZipContent(true);
              BatchAnnotateImagesResponse response = annotateRequest.execute();
  
              return convertResponseToString(response);
          } catch (GoogleJsonResponseException e) {
              Log.d(TAG, "failed to make API request because " + e.getContent());
          } catch (IOException e) {
              Log.d(TAG, "failed to make API request because of other IOException " + e.getMessage());
          }
          return "Cloud Vision API request failed. Check logs for details.";
      }
  

• Currently I use version minSdkVersion 21 and targetSdkVersion 26

• Android 3.2.1
• I don't activate free trial google api.
• Link code github you can downnload and test:

  https://github.com/Thumar/GoogleVisionAPI

• Who can help me with this issue?