MSSQL Database backup are not realized

[israelus]

Hi,
doing the daily backup MSSQL's database backup are not realized and it appears in the logs:

Warning: psabackup.InformationalException: Unable to dump MS SQL database. Probably SQL DMO do not installed or installed too old version of SQL DMO. Database backup will be not included to Plesk backup. ---> System.Runtime.InteropServices.COMException (0x8002801D): Biblioteca no registrada.
at System.Runtime.InteropServices.Marshal.ThrowExceptionForHR(Int32 errorCode, IntPtr errorInfo)
at System.Runtime.InteropServices.CustomMarshalers.EnumerableViewOfDispatch.GetEnumerator()
at System.Collections.IEnumerable.GetEnumerator()
at psabackup.MsSqlScriptGenerator.GenerateViewsScript(IEnumerable views, TextWriter outStream)
at psabackup.MsSqlScriptGenerator.GenerateDatabaseScript(TextWriter outStream)
at psabackup.data_base.onPostDumpOperation(XMLRow row, DumpEnv env, DumpOperation operation)

Some solution?