If your server has run out of disk space, you can try to regain some disk space by truncating the log files. You can do this in Model Explorer by right-clicking the database and selecting Backup > Backup and Truncate Log.

You can also perform the same operation using SSMS by running the following stored procedure on the master database:

For more information about stored procedures, refer to the following SQL Server help topic on how to execute a stored procedure:

https://docs.microsoft.com/sql/relational-databases/stored-procedures/execute-a-stored-procedure?view=sql-server-2017

For more information about backing up and deleting log files, see the Administration chapter of the Modeler help.