Stress leaves threads running after a fatal error

[10.200.241.112] All nodes available!
INFO:benchmark:Started cassandra on 3 nodes with git SHA: efaff1bff92fdf4cc84007a5cc1e641ebf889633
INFO:stress_compare:Running stress operation : user profile=https://dl.dropboxusercontent.com/u/15683245/8894_tiny.yaml  ops\(insert=1,\) n=1M -rate threads=3.
INFO:benchmark:Running stress from '/home/ryan/fab/stress/default/tools/bin/cassandra-stress' : user profile=https://dl.dropboxusercontent.com/u/15683245/8894a
INFO  23:50:05 Did not find Netty's native epoll transport in the classpath, defaulting to NIO.
Exception in thread "main" java.lang.RuntimeException: java.lang.IllegalArgumentException: clustering_key
        at org.apache.cassandra.stress.settings.StressSettings.getJavaDriverClient(StressSettings.java:198)
        at org.apache.cassandra.stress.StressProfile.maybeCreateSchema(StressProfile.java:162)
        at org.apache.cassandra.stress.settings.StressSettings.maybeCreateKeyspaces(StressSettings.java:207)
        at org.apache.cassandra.stress.StressAction.run(StressAction.java:55)
        at org.apache.cassandra.stress.Stress.main(Stress.java:114)
Caused by: java.lang.IllegalArgumentException: clustering_key
        at com.datastax.driver.core.ColumnMetadata$Raw$Kind.fromStringV3(ColumnMetadata.java:235)
        at com.datastax.driver.core.ColumnMetadata$Raw.fromRow(ColumnMetadata.java:263)
        at com.datastax.driver.core.SchemaParser.groupByKeyspaceAndCf(SchemaParser.java:408)
        at com.datastax.driver.core.SchemaParser$2.refresh(SchemaParser.java:246)
        at com.datastax.driver.core.ControlConnection.refreshSchema(ControlConnection.java:323)
        at com.datastax.driver.core.ControlConnection.tryConnect(ControlConnection.java:264)
        at com.datastax.driver.core.ControlConnection.reconnectInternal(ControlConnection.java:187)
        at com.datastax.driver.core.ControlConnection.connect(ControlConnection.java:75)
        at com.datastax.driver.core.Cluster$Manager.init(Cluster.java:1265)
        at com.datastax.driver.core.Cluster.getMetadata(Cluster.java:337)
        at org.apache.cassandra.stress.util.JavaDriverClient.connect(JavaDriverClient.java:121)
        at org.apache.cassandra.stress.settings.StressSettings.getJavaDriverClient(StressSettings.java:189)
        ... 4 more