on pants 1.2.0, and consistently ran into

18:47:23 00:18         [cache].
                     Using cached artifacts for 1 target.
18:47:23 00:18         [zinc]
                       java.lang.NoClassDefFoundError: scala/Option
                       	at java.lang.Class.getDeclaredMethods0(Native Method)
                       	at java.lang.Class.privateGetDeclaredMethods(Class.java:2701)
                       	at java.lang.Class.privateGetMethodRecursive(Class.java:3048)
                       	at java.lang.Class.getMethod0(Class.java:3018)
                       	at java.lang.Class.getMethod(Class.java:1784)
                       	at com.martiansoftware.nailgun.NGSession.run(NGSession.java:252)
                       Caused by: java.lang.ClassNotFoundException: scala.Option
                       	at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
                       	at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
                       	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
                       	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
                       	... 6 more

starting from yesterday