public Builder setError(com.google.rpc.Status value) {
      if (errorBuilder_ == null) {
        if (value == null) {
          throw new NullPointerException();
        }
        error_ = value;
      } else {
        errorBuilder_.setMessage(value);
      }
      bitField0_ |= 0x00000008;
      onChanged();
      return this;
    }
<pre>
Only populated when operation doesn't succeed.
</pre>

<code>.google.rpc.Status error = 4;</code>
java-translate/proto-google-cloud-translate-v3/src/main/java/com/google/cloud/translate/v3/ExportDataMetadata.java