Cannot delete user

[Promentum]

Error removing the user: Default project cannot be deleted [ProjectID: 66]

[kolaente]

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Can´t delete user

When using command: sudo docker exec -it vikunja-api-1 /app/vikunja/vikunja user delete 4 --now I get this error, why? Error removing the user: Default project cannot be deleted [ProjectID: 18] Thank you