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SQL Server error code

SQL Server error 3108

SQL Server raises error 3108 at severity 16, which marks a problem with the query or data that you can correct.

To restore the master database, the server must be running in single-user mode. For information on starting in single-user mode, see "How to: Start an Instance of SQL Server (sqlservr.exe)" in Books Online.
Msg3108
Severity16
Group3000–3999

Source: Database Engine events and errors