java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at com.datastax.driver.core.HostConnectionPool.waitForConnection(HostConnectionPool.java:203)
at com.datastax.driver.core.HostConnectionPool.borrowConnection(HostConnectionPool.java:107)
at com.datastax.driver.core.RequestHandler.query(RequestHandler.java:112)
at com.datastax.driver.core.RequestHandler.sendRequest(RequestHandler.java:93)
at com.datastax.driver.core.Session$Manager.execute(Session.java:513)
at com.datastax.driver.core.Session$Manager.executeQuery(Session.java:549)

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