Cannot open EM Client but have used it for years

I get this error message and cannot open EM Client:
System.Data.SQLite.SQLiteException: Unable to open the database file
unable to open database file
at System.Data.SQLite.SQLite3.Prepare(SQLiteConnection cnn, String strSql, SQLiteStatement previous, UInt32 timeoutMS, String& strRemain)
at System.Data.SQLite.SQLiteCommand.BuildNextCommand()
at System.Data.SQLite.SQLiteCommand.GetStatement(Int32 index)
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 System.Data.SQLite.SQLiteConnection.Open()
at DbRepair.DbTools.OpenConnection(String fileName)
at DbRepair.Form1.CheckCorruption()
at DbRepair.Form1.Check(Object state)

Hello,
what did you do before it happened? Any update?