java.util.concurrent.TimeoutException: Operation timed out - received only 0 responses from .

[mobiledreamers]

Can you plase tell what this error is ?

ERROR - error writing key ruske
*java.util.concurrent.TimeoutException: Operation timed out - received only
0 responses from  .*
        at
org.apache.cassandra.service.QuorumResponseHandler.get(QuorumResponseHandler.java:88)
        at
org.apache.cassandra.service.StorageProxy.insertBlocking(StorageProxy.java:164)
        at
org.apache.cassandra.service.CassandraServer.doInsert(CassandraServer.java:468)
        at
org.apache.cassandra.service.CassandraServer.batch_insert(CassandraServer.java:448)
        at
org.apache.cassandra.service.Cassandra$Processor$batch_insert.process(Cassandra.java:854)
        at
org.apache.cassandra.service.Cassandra$Processor.process(Cassandra.java:627)
        at
org.apache.thrift.server.TThreadPoolServer$WorkerProcess.run(TThreadPoolServer.java:253)
        at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
        at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
        at java.lang.Thread.run(Thread.java:619)


Errors