Internal Server Error, 500
Causes
After publish you get an error like this
Internal Server Error, 500: Publish or checkout issue,
Or you get a lot of files with “Checkin Error” status
In that case your database is full, it is generally due to SQL Server Express usage
This is usually due to the use of a SQL Server Express database which is limited to a size of 10GB
Solution
Migrate to a SQL Server database edition other than SQL Server Express
https://sqlserverbuilds.blogspot.com/2019/02/sql-server-editions.html