The file "C:\Program Files\Microsoft SQL Server\MSSQL.2\MSSQL\DATA\mastlog.ldf" is compressed but does not reside in a read-only database or filegroup. The file must be decompressed.
The problem is that the database file is compressed, to uncompress the database file:
- Right click on it
- Select properties
- Click on the Advance button
- Be sure the Compress contents to save disk space, is not checked
