java.lang.NoClassDefFoundError: scala/Option in 'resources-example'

[sake92]

PS C:\cbt\examples\resources-example> cbt direct runFlat
INFO: Could not find files for the given pattern(s).
Exception in thread "main" java.lang.NoClassDefFoundError: scala/Option
        at java.lang.Class.getDeclaredMethods0(Native Method)
        at java.lang.Class.privateGetDeclaredMethods(Class.java:2701)
        at java.lang.Class.privateGetPublicMethods(Class.java:2902)
        at java.lang.Class.getMethods(Class.java:1615)
        at cbt.reflect.Module$$anonfun$findStaticMethod$3.apply(reflect.scala:154)
        at cbt.reflect.Module$$anonfun$findStaticMethod$3.apply(reflect.scala:155)
        at scala.Option.flatMap(Option.scala:171)
        at cbt.reflect.Module$class.findStaticMethod(reflect.scala:153)
        at cbt.Stage1Lib.findStaticMethod(Stage1Lib.scala:14)
        at cbt.reflect.Module$class.findStaticExitMethod(reflect.scala:139)
        at cbt.Stage1Lib.findStaticExitMethod(Stage1Lib.scala:14)
        at cbt.reflect.Module$class.findMain(reflect.scala:75)
        at cbt.Stage1Lib.findMain(Stage1Lib.scala:14)
        at cbt.DependencyImplementation$$anonfun$mainClass$1.apply(resolver.scala:93)
        at cbt.DependencyImplementation$$anonfun$mainClass$1.apply(resolver.scala:93)
        at scala.collection.TraversableLike$$anonfun$filterImpl$1.apply(TraversableLike.scala:248)
        at scala.collection.immutable.List.foreach(List.scala:381)
        at scala.collection.TraversableLike$class.filterImpl(TraversableLike.scala:247)
        at scala.collection.TraversableLike$class.filter(TraversableLike.scala:259)
        at scala.collection.AbstractTraversable.filter(Traversable.scala:104)
        at cbt.DependencyImplementation$class.mainClass(resolver.scala:93)
        at Build.mainClass(build.scala:2)
        at cbt.DependencyImplementation$class.mainClassOrFail(resolver.scala:87)
        at Build.mainClassOrFail(build.scala:2)
        at cbt.DependencyImplementation$class.runMain(resolver.scala:85)
        at Build.runMain(build.scala:2)
        at cbt.BaseBuild$class.run(BasicBuild.scala:217)
        at Build.run(build.scala:2)
        at cbt.DynamicOverrides$class.runFlat(DynamicOverrides.scala:83)
        at Build.runFlat(build.scala:2)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at cbt.Lib$$anonfun$cbt$Lib$$callInternal$1$$anonfun$apply$9$$anonfun$apply$11$$anonfun$apply$12.apply(Lib.scala:155)
        at cbt.reflect.Module$$anon$1.run(reflect.scala:178)
        at cbt.reflect.Module$$anon$1.run(reflect.scala:177)
        at cbt.reflect.TrapSystemExit.run(TrapSystemExit.java:15)
        at cbt.reflect.Module$class.trapExitCodeOrValue(reflect.scala:176)
        at cbt.Stage1Lib.trapExitCodeOrValue(Stage1Lib.scala:14)
        at cbt.Lib$$anonfun$cbt$Lib$$callInternal$1$$anonfun$apply$9$$anonfun$apply$11.apply(Lib.scala:155)
        at cbt.Lib$$anonfun$cbt$Lib$$callInternal$1$$anonfun$apply$9$$anonfun$apply$11.apply(Lib.scala:153)
        at scala.Option.map(Option.scala:146)
        at cbt.Lib$$anonfun$cbt$Lib$$callInternal$1$$anonfun$apply$9.apply(Lib.scala:153)
        at cbt.Lib$$anonfun$cbt$Lib$$callInternal$1$$anonfun$apply$9.apply(Lib.scala:150)
        at scala.Option.map(Option.scala:146)
        at cbt.Lib$$anonfun$cbt$Lib$$callInternal$1.apply(Lib.scala:150)
        at cbt.Lib$$anonfun$3.cbt$Lib$$anonfun$$g$1(Lib.scala:103)
        at cbt.Lib$$anonfun$3$$anonfun$apply$5.apply(Lib.scala:105)
        at cbt.Lib.cbt$Lib$$callInternal(Lib.scala:175)
        at cbt.Lib.getReflective(Lib.scala:143)
        at cbt.Lib.callReflective(Lib.scala:106)
        at cbt.Stage2$.run(Stage2.scala:35)
        at cbt.Stage2.run(Stage2.scala)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at cbt.Stage1$.run(Stage1.scala:210)
        at cbt.Stage1.run(Stage1.scala)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at cbt.NailgunLauncher.main(NailgunLauncher.java:123)
Caused by: java.lang.ClassNotFoundException: scala.Option
        at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
        ... 65 more

OS: Windows
Same without using Nailgun.