Application Error???

On opening eM, it went through a database check and reported:
System.Data.SQLite.SQLiteException (0x80004005): database is locked
database is locked
   at System.Data.SQLite.SQLite3.Step(SQLiteStatement stmt)
   at System.Data.SQLite.SQLiteDataReader.NextResult()
   at System.Data.SQLite.SQLiteDataReader…ctor(SQLiteCommand cmd, CommandBehavior behave)
   at System.Data.SQLite.SQLiteCommand.ExecuteReader(CommandBehavior behavior)
   at System.Data.SQLite.SQLiteCommand.ExecuteNonQuery()
   at MailClient.Storage.Data.DataStore.GetConnection(String relativeName)
   at DbRepair.CorruptionChecker.CheckCorruption()
   at DbRepair.FormCheck.Check(Object state)

Its done this a couple of times previously