Error coming while inserting data

[rizcompeer]

Datatacenter: us-east; Host: /172.31.51.52; Rack: 1a
Datatacenter: us-east; Host: /172.31.21.57; Rack: 1c
Datatacenter: us-east; Host: /54.152.30.69; Rack: 1a
Datatacenter: us-east; Host: /172.31.25.141; Rack: 1c
com.datastax.driver.core.exceptions.UnavailableException: Not enough replica available for query at consistency ONE (1 required but only 0 alive)
at com.datastax.driver.core.exceptions.UnavailableException.copy(UnavailableException.java:79)
at com.datastax.driver.core.DefaultResultSetFuture.extractCauseFromExecutionException(DefaultResultSetFuture.java:289)
at com.datastax.driver.core.DefaultResultSetFuture.getUninterruptibly(DefaultResultSetFuture.java:205)
at com.datastax.driver.core.AbstractSession.execute(AbstractSession.java:52)
at in.co.itracksolution.dao.FullDataDao.insert(FullDataDao.java:93)
at in.co.itracksolution.push_device_data.insertFulldata(push_device_data.java:71)
at com.wanhive.rts.handler.RequestHandler.UpdateDatabase(RequestHandler.java:380)
at com.wanhive.rts.handler.RequestHandler.handleProtocol(RequestHandler.java:40)
at com.wanhive.rts.WorkerClass.run(WorkerClass.java:72)
at java.lang.Thread.run(Thread.java:745)

[bailoo]

Cluster restored to old state. 2 nodes. Please check now.