public Builder clearError() {
      bitField0_ = (bitField0_ & ~0x00000400);
      error_ = null;
      if (errorBuilder_ != null) {
        errorBuilder_.dispose();
        errorBuilder_ = null;
      }
      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-v1p2beta1/src/main/java/com/google/cloud/vision/v1p2beta1/AnnotateImageResponse.java