Had been working fine, but getting this error today.
My alert code was taken from your ATM sample code:
NinjaTrader.NinjaScript.Alert.AlertCallback(NinjaTrader.Cbi.Instrument.GetInstrument("MES 09-20"), this, "LongEntryAlert", NinjaTrader.Core.Globals.Now, Priority.High, msg, NinjaTrader.Core.Globals.InstallDir + @"\sounds\Alert1.wav", new SolidColorBrush(Colors.Blue), new SolidColorBrush(Colors.White), 0);
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