Time.now error

gistfile1.txt

ore:/core/rubinius/bootstrap/time.rb:28:in `Time': internal implementation error - NoClassDefFoundError org/jruby/truffle/nodes/rubinius/TimePrimitiveNodesFactory$TimeSNowPrimitiveNodeFactory$TimeSNowPrimitiveRubyClassNode org.jruby.truffle.nodes.rubinius.TimePrimitiveNodesFactory$TimeSNowPrimitiveNodeFactory$TimeSNowPrimitiveBaseNode.specialize0(TimePrimitiveNodesFactory.java:140) (RubyTruffleError)
	from json_test.rb:1784:in `<main>'
Truffle internal error: java.lang.NoClassDefFoundError: org/jruby/truffle/runtime/subsystems/ThreadManager$1
java.lang.NoClassDefFoundError: org/jruby/truffle/runtime/subsystems/ThreadManager$1
	at org.jruby.truffle.runtime.subsystems.ThreadManager.shutdown(ThreadManager.java:150)
	at org.jruby.truffle.runtime.RubyContext.shutdown(RubyContext.java:273)
	at org.jruby.truffle.TruffleBridgeImpl.shutdown(TruffleBridgeImpl.java:198)
	at org.jruby.Ruby.shutdownTruffleBridge(Ruby.java:948)
	at org.jruby.Main.doRunFromMain(Main.java:406)
	at org.jruby.Main.internalRun(Main.java:299)
	at org.jruby.Main.run(Main.java:226)
	at org.jruby.Main.main(Main.java:198)
Caused by: java.lang.ClassNotFoundException: org.jruby.truffle.runtime.subsystems.ThreadManager$1
	at java.net.URLClassLoader$1.run(URLClassLoader.java:372)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:360)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
	... 8 more