Hi. Thank you for the book. I run Arch Linux as my system. I notice that when I had java-11-openjdk installed, I get an error when I run things inside amm. For example,

[kishore@archlinux ~]$ amm
Loading...
Welcome to the Ammonite Repl 2.1.4 (Scala 2.13.2 Java 11.0.7)
@ 1 
java.lang.UnsupportedClassVersionError: io/github/retronym/java9rtexport/Export has been compiled by a more recent version of the Java Runtime (class file version 57.0), this version of the Java Runtime only recognizes class file versions up to 55.0
  ammonite.runtime.Classpath$.classpath(Classpath.scala:77)
  ammonite.interp.CompilerLifecycleManager.init(CompilerLifecycleManager.scala:85)
  ammonite.interp.CompilerLifecycleManager.preprocess(CompilerLifecycleManager.scala:57)
  ammonite.interp.Interpreter.$anonfun$processLine$4(Interpreter.scala:247)
  ammonite.util.Res$Success.flatMap(Res.scala:62)
  ammonite.interp.Interpreter.$anonfun$processLine$2(Interpreter.scala:240)
  ammonite.util.Catching.flatMap(Res.scala:115)
  ammonite.interp.Interpreter.processLine(Interpreter.scala:239)
  ammonite.repl.Repl.$anonfun$action$8(Repl.scala:197)
  ammonite.util.Res$Success.flatMap(Res.scala:62)
  ammonite.repl.Repl.$anonfun$action$4(Repl.scala:184)
  ammonite.repl.Scoped.$anonfun$flatMap$1(Signaller.scala:45)
  ammonite.repl.Signaller.apply(Signaller.scala:28)
  ammonite.repl.Scoped.flatMap(Signaller.scala:45)
  ammonite.repl.Scoped.flatMap$(Signaller.scala:45)
  ammonite.repl.Signaller.flatMap(Signaller.scala:16)
  ammonite.repl.Repl.$anonfun$action$2(Repl.scala:176)
  ammonite.util.Catching.flatMap(Res.scala:115)
  ammonite.repl.Repl.action(Repl.scala:168)
  ammonite.repl.Repl.loop$1(Repl.scala:208)
  ammonite.repl.Repl.run(Repl.scala:223)
  ammonite.Main.$anonfun$run$1(Main.scala:223)
  scala.Option.getOrElse(Option.scala:201)
  ammonite.Main.run(Main.scala:211)
  ammonite.MainRunner.$anonfun$runRepl$1(Main.scala:413)
  ammonite.MainRunner.watchLoop(Main.scala:394)
  ammonite.MainRunner.runRepl(Main.scala:413)
  ammonite.Main$.main0(Main.scala:320)
  ammonite.Main$.main(Main.scala:270)
  ammonite.Main.main(Main.scala)

After I updated to java-14-openjdk things work fine for me now.

[kishore@archlinux ~]$ amm
Loading...
Welcome to the Ammonite Repl 2.1.4 (Scala 2.13.2 Java 14.0.1)
@ 1 + 1 
res0: Int = 2

Hoping this helps anyone else who comes across the same issue.

I have installed from the community repo

Chapter 2 Notes, Errata, and Discussion: Setting Up #2

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