Cassandra 2.1 - Repair issue

gistfile1.txt

INFO  [AntiEntropyStage:227] 2014-09-28 15:00:41,982 RepairSession.java:171 - [repair #1d30ffe0-474a-11e4-84bd-79f3bc6874b0] Received merkle tree for registrynodedata from /172.16.66.81
ERROR [AntiEntropyStage:227] 2014-09-28 15:00:41,982 CassandraDaemon.java:166 - Exception in thread Thread[AntiEntropyStage:227,5,main]
java.lang.ClassCastException: null
ERROR [RepairJobTask:3] 2014-09-28 15:00:41,983 RepairJob.java:127 - Error occurred during snapshot phase
java.lang.RuntimeException: Could not create snapshot at /172.16.66.81
	at org.apache.cassandra.repair.SnapshotTask$SnapshotCallback.onFailure(SnapshotTask.java:77) ~[apache-cassandra-2.1.0.jar:2.1.0]
	at org.apache.cassandra.net.ResponseVerbHandler.doVerb(ResponseVerbHandler.java:48) ~[apache-cassandra-2.1.0.jar:2.1.0]
	at org.apache.cassandra.net.MessageDeliveryTask.run(MessageDeliveryTask.java:62) ~[apache-cassandra-2.1.0.jar:2.1.0]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_20]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_20]
	at java.lang.Thread.run(Thread.java:745) [na:1.8.0_20]
INFO  [AntiEntropySessions:175] 2014-09-28 15:00:41,983 RepairSession.java:260 - [repair #201c38f0-474a-11e4-84bd-79f3bc6874b0] new session: will sync /172.16.66.81, /172.16.66.3 on range (83423146128818376165891543690430529581,84243520090165116570202291874390938270] for m2mp.[registrynode, registrynodedata, user, timeseries, timeseries_index, registrynodechildren, generalsettings, domain]
ERROR [AntiEntropySessions:174] 2014-09-28 15:00:41,984 RepairSession.java:303 - [repair #1d30ffe0-474a-11e4-84bd-79f3bc6874b0] session completed with the following error
java.io.IOException: Failed during snapshot creation.
	at org.apache.cassandra.repair.RepairSession.failedSnapshot(RepairSession.java:344) ~[apache-cassandra-2.1.0.jar:2.1.0]
	at org.apache.cassandra.repair.RepairJob$2.onFailure(RepairJob.java:128) ~[apache-cassandra-2.1.0.jar:2.1.0]
	at com.google.common.util.concurrent.Futures$4.run(Futures.java:1172) ~[guava-16.0.jar:na]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_20]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_20]
	at java.lang.Thread.run(Thread.java:745) [na:1.8.0_20]
ERROR [AntiEntropySessions:174] 2014-09-28 15:00:41,984 CassandraDaemon.java:166 - Exception in thread Thread[AntiEntropySessions:174,5,RMI Runtime]
java.lang.RuntimeException: java.io.IOException: Failed during snapshot creation.
	at com.google.common.base.Throwables.propagate(Throwables.java:160) ~[guava-16.0.jar:na]
	at org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:32) ~[apache-cassandra-2.1.0.jar:2.1.0]
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[na:1.8.0_20]
	at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[na:1.8.0_20]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) ~[na:1.8.0_20]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_20]
	at java.lang.Thread.run(Thread.java:745) [na:1.8.0_20]
Caused by: java.io.IOException: Failed during snapshot creation.
	at org.apache.cassandra.repair.RepairSession.failedSnapshot(RepairSession.java:344) ~[apache-cassandra-2.1.0.jar:2.1.0]
	at org.apache.cassandra.repair.RepairJob$2.onFailure(RepairJob.java:128) ~[apache-cassandra-2.1.0.jar:2.1.0]
	at com.google.common.util.concurrent.Futures$4.run(Futures.java:1172) ~[guava-16.0.jar:na]
	... 3 common frames omitted