Do we need to update Orbeon?

We are trying to use the fr:error-summary component inside a 4 year old orbeon project but we can't make it work. We get the following error message:





The project is now using orbeon v3.7.1 and exist v1.3. Is this error due to an out-of-date build of orbeon? If not, how can orbeon be configured in order to make these lines work?

<fr:error-summary observer="my-group">
    <fr:label>Your Form Contains the Following Errors</fr:label>
</fr:error-summary>

Thanks in advance!!