Exception in thread "main" java.lang.NullPointerException
	at org.apache.giraph.utils.ReflectionUtils.newInstance(ReflectionUtils.java:79)
	at org.apache.giraph.utils.WritableUtils.createWritable(WritableUtils.java:68)
	at org.apache.giraph.factories.DefaultVertexIdFactory.newInstance(DefaultVertexIdFactory.java:47)
	at org.apache.giraph.factories.DefaultVertexIdFactory.newInstance(DefaultVertexIdFactory.java:30)
	at org.apache.giraph.conf.ImmutableClassesGiraphConfiguration.createVertexId(ImmutableClassesGiraphConfiguration.java:621)
	at org.apache.giraph.conf.ImmutableClassesGiraphConfiguration.createReusableEdge(ImmutableClassesGiraphConfiguration.java:766)
	at com.facebook.digraph.fof_score.io.hive.FofScoreHiveToEdge.setConf(FofScoreHiveToEdge.java:64)
	at org.apache.giraph.conf.ImmutableClassesGiraphConfiguration.configureIfPossible(ImmutableClassesGiraphConfiguration.java:137)
	at org.apache.giraph.utils.ConfigurationUtils.configureIfPossible(ConfigurationUtils.java:147)
	at org.apache.giraph.utils.ReflectionUtils.newInstance(ReflectionUtils.java:111)
	at org.apache.giraph.hive.common.HiveUtils.newInstance(HiveUtils.java:362)
	at org.apache.giraph.hive.common.HiveUtils.newHiveToEdge(HiveUtils.java:319)
	at org.apache.giraph.hive.input.edge.HiveEdgeInputFormat.checkInputSpecs(HiveEdgeInputFormat.java:65)
	at org.apache.giraph.io.internal.WrappedEdgeInputFormat.checkInputSpecs(WrappedEdgeInputFormat.java:64)
	at org.apache.giraph.hive.HiveGiraphRunner.prepareHiveEdgeInputs(HiveGiraphRunner.java:386)
	at org.apache.giraph.hive.HiveGiraphRunner.handleCommandLine(HiveGiraphRunner.java:544)
	at org.apache.giraph.hive.HiveGiraphRunner.run(HiveGiraphRunner.java:254)
	at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:68)
	at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:82)
	at com.facebook.digraph.fof_score.FofScore.main(FofScore.java:28)
	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:601)
	at org.apache.hadoop.util.RunJar.main(RunJar.java:156)