我正在使用JMeter 3.2，其中一个请求JSON Exttractor variable name为SenderId，JSON Path Expressions为$[0].selectedSender.id我在下面看到异常运行测试，有人可以帮我解决这个问题吗？
2017-07-26 14:43:34,902 ERROR o.a.j.JMeter: Uncaught exception:
java.lang.NoClassDefFoundError: Could not initialize class org.apache.jmeter.extractor.json.jsonpath.JSONManager
at org.apache.jmeter.extractor.json.jsonpath.JSONPostProcessor$1.initialValue(JSONPostProcessor.java:60) ~[ApacheJMeter_components.jar:3.2 r1790748]
at org.apache.jmeter.extractor.json.jsonpath.JSONPostProcessor$1.initialValue(JSONPostProcessor.java:57) ~[ApacheJMeter_components.jar:3.2 r1790748]
at java.lang.ThreadLocal.setInitialValue(Unknown Source) ~[?:1.8.0_111]
at java.lang.ThreadLocal.get(Unknown Source) ~[?:1.8.0_111]
at org.apache.jmeter.extractor.json.jsonpath.JSONPostProcessor.threadFinished(JSONPostProcessor.java:242) ~[ApacheJMeter_components.jar:3.2 r1790748]
at org.apache.jmeter.threads.JMeterThread$ThreadListenerTraverser.addNode(JMeterThread.java:679) ~[ApacheJMeter_core.jar:3.2 r1790748]
at org.apache.jorphan.collections.HashTree.traverseInto(HashTree.java:996) ~[jorphan.jar:3.2 r1790748]
at org.apache.jorphan.collections.HashTree.traverseInto(HashTree.java:997) ~[jorphan.jar:3.2 r1790748]
at org.apache.jorphan.collections.HashTree.traverseInto(HashTree.java:997) ~[jorphan.jar:3.2 r1790748]
at org.apache.jorphan.collections.HashTree.traverse(HashTree.java:978) ~[jorphan.jar:3.2 r1790748]
at org.apache.jmeter.threads.JMeterThread.threadFinished(JMeterThread.java:651) ~[ApacheJMeter_core.jar:3.2 r1790748]
at org.apache.jmeter.threads.JMeterThread.run(JMeterThread.java:310) ~[ApacheJMeter_core.jar:3.2 r1790748]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_111]