JMeter 3.2无法初始化类org.apache.JMeter.extractor.json.jsonpath.JSONManager

我使用的是JMeter 3.2，对于其中一个请求，我使用变量名为SenderId的JSON Exttractor，JSON路径表达式为$[0]。selectedSender.id，当我运行测试时，我发现以下异常，有人能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]

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如果您使用的是3.0以上的jmeter版本，则需要安装插件

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你能分享你的json后处理器定义吗？它在取样器下面吗？