java.util.ConcurrentModificationException: This exception has no message.

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java.util.ConcurrentModificationException:
at java.util.HashMap$HashIterator.nextEntry(HashMap.java:810)
at org.apache.cassandra.dht.BootStrapper.getBootstrapSource(BootStrapper.java:146)
at org.apache.cassandra.dht.BootStrapper.getBalancedToken(BootStrapper.java:135)
at org.apache.cassandra.dht.BootStrapper.getBootstrapTokens(BootStrapper.java:115)
at org.apache.cassandra.service.StorageService.joinTokenRing(StorageService.java:611)
at org.apache.cassandra.service.StorageService.initServer(StorageService.java:499)
at org.apache.cassandra.service.StorageService.initServer(StorageService.java:397)
at org.apache.cassandra.service.CassandraDaemon.setup(CassandraDaemon.java:309)
at org.apache.cassandra.service.CassandraDaemon.activate(CassandraDaemon.java:397)
at undefined.CassandraServer.start(CassandraServer.java:415)

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