java.lang.NullPointerException: Cannot invoke "javax.sound.midi.Receiver.send(javax.sound.midi.MidiMessage, long)" because "receiver" is null
	at s.DavidMusicModule.sendSysexMessage(DavidMusicModule.java:96)
	at s.DavidMusicModule.InitMusic(DavidMusicModule.java:71)
	at doom.DoomMain.<init>(DoomMain.java:2760)
	at mochadoom.Engine.<init>(Engine.java:89)
	at mochadoom.Engine.main(Engine.java:52)
	at org.codehaus.groovy.vmplugin.v8.IndyInterface.fromCache(IndyInterface.java:321)
	at Script_90b0e9368132b96b.runScript(Script_90b0e9368132b96b:4)
	at org.codehaus.groovy.vmplugin.v8.IndyInterface.fromCache(IndyInterface.java:321)
	at nextflow.script.BaseScript.run0(BaseScript.groovy:159)
	at org.codehaus.groovy.vmplugin.v8.IndyInterface.fromCache(IndyInterface.java:321)
	at nextflow.script.BaseScript.run(BaseScript.groovy:209)
	at nextflow.script.ScriptParser.runScript(ScriptParser.groovy:236)
	at nextflow.script.ScriptRunner.run(ScriptRunner.groovy:243)
	at nextflow.script.ScriptRunner.execute(ScriptRunner.groovy:138)
	at nextflow.cli.CmdRun.run(CmdRun.groovy:376)
	at nextflow.cli.Launcher.run(Launcher.groovy:503)
	at nextflow.cli.Launcher.main(Launcher.groovy:658)