Upgrade Neos 8.3 → 9.0

Using Neos & Flow
1

I am doing a migration from Migration overview - Upgrade Instructions 8.3 → 9.0 - Version 9.x - Neos Upgrade Instructions - API - Neos Docs
And I am stuck at ./flow site:exportLegacyData --path ./migratedContent

By executing it I see a lot of errors like:

Error: Failed to find parent node for node with id “08aaf220-3483-4ad3-8234-31b25f394d37” and dimensions: {“language”:“en_US”}. Please ensure that the new content repository has a valid content dimension configuration. Also note that the old CR can sometimes have orphaned nodes.

Any ideas how to work out this kind of error?

2

Did you run a node:repair before you ran the export?
Did it still find any issues?

3

Yes I did at the beginning $ ./flow node:repair

And it fixed some nodes.