Problem with 0.29.486

Getting an error compiling:

scalac: Error: org/jetbrains/plugin/scala/compiler/IncrementalType
java.lang.NoClassDefFoundError:
org/jetbrains/plugin/scala/compiler/IncrementalType
     at
org.jetbrains.jps.incremental.scala.remote.Arguments$.from(Arguments.scala:83)
     at org.jetbrains.jps.incremental.scala.remote.Main$.nailMain(Main.scala:29)
     at org.jetbrains.jps.incremental.scala.remote.Main.nailMain(Main.scala)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
     at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
     at java.lang.reflect.Method.invoke(Method.java:606)
     at com.martiansoftware.nailgun.NGSession.run(Unknown Source)