Hello,
Are you using the caching method that is described at the bottom of the article? If so, that could be the issue because it uses the old API. That could also be the issue without caching because this example seems to use TreeHelper instead of TreeProvider. Please take a look at the update from
5.5R2 > 6 and from
6 > 7 articles as well as the newest
API reference.
Please let me know if you have any additional questions.
Best Regards,
Sandro