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scala.collection.immutable.$colon$colon.hd$1()Ljava/lang/Object;
java.lang.NoSuchMethodError: scala.collection.immutable.$colon$colon.hd$1()Ljava/lang/Object;	at org.graphframes.GraphFrame.findSimple(GraphFrame.scala:370)	at org.graphframes.GraphFrame.find(GraphFrame.scala:263)	at org.graphframes.lib.BFS$.org$graphframes$lib$BFS$$run(BFS.scala:159)	at org.graphframes.lib.BFS.run(BFS.scala:126)	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 py4j.reflection.MethodInvoker.invoke(MethodInvoker.java:231)	at py4j.reflection.ReflectionEngine.invoke(ReflectionEngine.java:381)	at py4j.Gateway.invoke(Gateway.java:290)	at py4j.commands.AbstractCommand.invokeMethod(AbstractCommand.java:133)	at py4j.commands.CallCommand.execute(CallCommand.java:79)	at py4j.GatewayConnection.run(GatewayConnection.java:209)	at java.lang.Thread.run(Thread.java:745)