Problem with Nested Pages Migrator

Hi everyone,
I decided for Xwiki to become our Confluence successor. So far everything worked fine. I installed the recent Xwiki release on a Linux system, used the Confluence XML + FilterStreams extension to import a small part of our Confluence.
After the import the hierarchy of pages wasn’t there anymore. After reading in this forum and a lot of googling I tried using the Nested Files Migrator.
The Migrator recognized breakages, but after computing the plan I get the notification that there is nothing to do. Which seems kind of strange regarding the amount of breakages.
This might totallly be my fault but I followed the instructions. Is the Nested Pages Migrator maybe not compatible with recent Xwiki-releases? Or are there simply breakages that the Migrator can’t handle?

Thank you very much.