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当我运行命令时$ nodetool help，出现以下错误；

java.lang.NullPointerException
  at org.apache.cassandra.config.DatabaseDescriptor.getDiskFailurePolicy(DatabaseDescriptor.java:1877)
  at org.apache.cassandra.utils.JVMStabilityInspector.inspectThrowable(JVMStabilityInspector.java:62)
  at org.apache.cassandra.io.util.FileUtils.<clinit>(FileUtils.java:79)
  at org.apache.cassandra.utils.FBUtilities.getToolsOutputDirectory(FBUtilities.java:807)
  at org.apache.cassandra.tools.NodeTool.printHistory(NodeTool.java:199)
  at org.apache.cassandra.tools.NodeTool.main(NodeTool.java:167)

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如果有人有任何提示，请告诉我。