I've tried to run the project 'play-scala' from activator projects with the following: ran 'activator new' a console, choosed 'play-scala' template, 'activator run' in the project folder.
But I always get the exception:
java.lang.RuntimeException: No main class detected. at scala.sys.package$.error(package.scala:27) at sbt.Defaults$$anonfun$runTask$1$$anonfun$apply$38$$anonfun$apply$39$$anonfun$29.apply(Defaults.scala:749) at sbt.Defaults$$anonfun$runTask$1$$anonfun$apply$38$$anonfun$apply$39$$anonfun$29.apply(Defaults.scala:749) at scala.Option.getOrElse(Option.scala:120) at sbt.Defaults$$anonfun$runTask$1$$anonfun$apply$38$$anonfun$apply$39.apply(Defaults.scala:749) at sbt.Defaults$$anonfun$runTask$1$$anonfun$apply$38$$anonfun$apply$39.apply(Defaults.scala:748) at scala.Function1$$anonfun$compose$1.apply(Function1.scala:47) at sbt.$tilde$greater$$anonfun$$u2219$1.apply(TypeFunctions.scala:40) at sbt.std.Transform$$anon$4.work(System.scala:63) at sbt.Execute$$anonfun$submit$1$$anonfun$apply$1.apply(Execute.scala:228) at sbt.Execute$$anonfun$submit$1$$anonfun$apply$1.apply(Execute.scala:228) at sbt.ErrorHandling$.wideConvert(ErrorHandling.scala:17) at sbt.Execute.work(Execute.scala:237) at sbt.Execute$$anonfun$submit$1.apply(Execute.scala:228) at sbt.Execute$$anonfun$submit$1.apply(Execute.scala:228) at sbt.ConcurrentRestrictions$$anon$4$$anonfun$1.apply(ConcurrentRestrictions.scala:159) at sbt.CompletionService$$anon$2.call(CompletionService.scala:28)
My env:
Ubuntu 16.04 LTS, Scala 2.12.1, sbt 0.13.13, OpenJDK 1.8.0_111-8u111-b14-2ubuntu0.16.04.2-b14.
