public Builder setError(com.google.rpc.Status value) {
      if (errorBuilder_ == null) {
        if (value == null) {
          throw new NullPointerException();
        }
        error_ = value;
      } else {
        errorBuilder_.setMessage(value);
      }
      bitField0_ |= 0x00001000;
      onChanged();
      return this;
    }
<pre>
If set, represents the error message for the operation.
Note that filled-in image annotations are guaranteed to be
correct, even when `error` is set.
</pre>

<code>.google.rpc.Status error = 9;</code>
java-vision/proto-google-cloud-vision-v1/src/main/java/com/google/cloud/vision/v1/AnnotateImageResponse.java