private com.google.protobuf.SingleFieldBuilderV3<
            com.google.rpc.LocalizedMessage,
            com.google.rpc.LocalizedMessage.Builder,
            com.google.rpc.LocalizedMessageOrBuilder>
        getErrorMessageFieldBuilder() {
      if (errorMessageBuilder_ == null) {
        errorMessageBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.rpc.LocalizedMessage,
                com.google.rpc.LocalizedMessage.Builder,
                com.google.rpc.LocalizedMessageOrBuilder>(
                getErrorMessage(), getParentForChildren(), isClean());
        errorMessage_ = null;
      }
      return errorMessageBuilder_;
    }
<pre>
Output only. The localized error message.
</pre>

<code>
.google.rpc.LocalizedMessage error_message = 2 [(.google.api.field_behavior) = OUTPUT_ONLY];
</code>
java-vmmigration/proto-google-cloud-vmmigration-v1/src/main/java/com/google/cloud/vmmigration/v1/MigrationError.java