Unknown column core_basetreenode.tree_id in order clause

[new0ne]

Description Worker throws errors when importing a pdf-document from IMPORTER_DIR.

Expected Worker should import pdf from IMPORTER_DIR without errors.

Actual Log indicates there is a column used in a order clause of a sql statement which isn't present in that table. "django.db.utils.OperationalError: (1054, "Unknown column 'core_basetreenode.tree_id' in 'order clause'")" HOWEVER: When I look at the database, its actually there: and that table even has a record for that file: so... I dont get it, sorry. I`d like to help but i don't know enough about how papermerge works... yet.

Info: Architecture: Everything on one machine except mysql which runs on a dedicated server. OS: Ubuntu 20.04.2 LTS Webserver: Apache/2.4.41 Mysql server: 5.7 Papermerge release: 2.0.1 python: 3.8.10 django: 3.2 mod-wsgi: 4.8.0 mq: redis-server 5.0.7 Papermerge_Worker_failed_log.txt