Hello; It's a problem with the database... there was probably some failed change script, a while ago. But beyond that diagnosing/troubleshooting isn't going to be trivial and not worth the time, especially since... Postgres has been deprecated in 5.2. It won't be available in 5.3. So, I would recommend to take the opportunity to first move to SQL Server (i.e. install a new instance w/ same version that uses SQL Server). You can use this guide to migrate feeds: https://inedo.com/support/kb/1168/proget-feed-migration Then, you can perform the upgrade to 5.2 on the new instance. You can migrate feed-by-feed.