当我启动Cassandra 2.0.3服务器时，我突然开始收到下面给出的错误，我删除了＆＃39;数据＆＃39;文件夹但仍然得到相同的错误。请帮忙
INFO 17:21:08,084 Enqueuing flush of Memtable-local@15628573(149/1490 serialized/live bytes, 6 ops)
INFO 17:21:08,087 Writing Memtable-local@15628573(149/1490 serialized/live bytes, 6 ops)
ERROR 17:21:08,121 Exception in thread Thread[FlushWriter:1,5,main]
java.lang.AssertionError: Memory was freed
at org.apache.cassandra.io.util.Memory.checkPosition(Memory.java:146)
at org.apache.cassandra.io.util.Memory.setMemory(Memory.java:60)
at org.apache.cassandra.utils.obs.OffHeapBitSet.clear(OffHeapBitSet.java:98)
at org.apache.cassandra.utils.obs.OffHeapBitSet.<init>(OffHeapBitSet.java:52)
at org.apache.cassandra.utils.FilterFactory.createFilter(FilterFactory.java:85)
at org.apache.cassandra.utils.FilterFactory.getFilter(FilterFactory.java:79)
at org.apache.cassandra.io.sstable.SSTableWriter$IndexWriter.<init>(SSTableWriter.java:418)
at org.apache.cassandra.io.sstable.SSTableWriter.<init>(SSTableWriter.java:102)
at org.apache.cassandra.db.Memtable$FlushRunnable.createFlushWriter(Memtable.java:395)
at org.apache.cassandra.db.Memtable$FlushRunnable.writeSortedContents(Memtable.java:337)
at org.apache.cassandra.db.Memtable$FlushRunnable.runWith(Memtable.java:320)
at org.apache.cassandra.io.util.DiskAwareRunnable.runMayThrow(DiskAwareRunnable.java:48)
at org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:28)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:744)