[Monguse]

Which ac installer do you have?

Because some have reported this:

Cannot load sound preset motor.DB-600_Series.start.begin (java.lang.Exception: Invalid preset format)
Cannot load sound preset motor.DB-600_Series.start.end (java.lang.Exception: Invalid preset format)
Cannot load sound preset motor.Rolls-Royce-Merlin.start.begin (java.lang.Exception: Invalid preset format)
Cannot load sound preset motor.Rolls-Royce-Merlin.start.end (java.lang.Exception: Invalid preset format)
Cannot load sound preset motor.Sabre.start.begin (java.lang.Exception: Invalid preset format)
Cannot load sound preset motor.Sabre.start.end (java.lang.Exception: Invalid preset format)

This is do to missing prs files