public Builder setError(com.google.rpc.Status.Builder builderForValue) {
      if (errorBuilder_ == null) {
        error_ = builderForValue.build();
      } else {
        errorBuilder_.setMessage(builderForValue.build());
      }
      bitField0_ |= 0x00000008;
      onChanged();
      return this;
    }
<pre>
If set, represents the error message for the failed request. The
`responses` field will not be set in this case.
</pre>

<code>.google.rpc.Status error = 4;</code>
java-vision/proto-google-cloud-vision-v1/src/main/java/com/google/cloud/vision/v1/AnnotateFileResponse.java