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我的负载测试，其中我采取我的测试数据的API一个CSV使用JMeter的，如果控制器CSV输入
这里是我的CSV看起来像
和我如果控制器是这样
然而，当我运行的线程组，我得到以下错误：
2017/08/04 09:52:14 ERROR - jmeter.control.IfController: Check Country: error while processing [USA==USA]
org.mozilla.javascript.EcmaError: ReferenceError: "USA" is not defined. (<cmd>#1)
at org.mozilla.javascript.ScriptRuntime.constructError(ScriptRuntime.java:3951)
at org.mozilla.javascript.ScriptRuntime.constructError(ScriptRuntime.java:3929)
at org.mozilla.javascript.ScriptRuntime.notFoundError(ScriptRuntime.java:4019)
at org.mozilla.javascript.ScriptRuntime.name(ScriptRuntime.java:1851)
at org.mozilla.javascript.gen._cmd__4._c_script_0(<cmd>:1)
at org.mozilla.javascript.gen._cmd__4.call(<cmd>)
at org.mozilla.javascript.ContextFactory.doTopCall(ContextFactory.java:393)
at org.mozilla.javascript.ScriptRuntime.doTopCall(ScriptRuntime.java:3282)
at org.mozilla.javascript.gen._cmd__4.call(<cmd>)
at org.mozilla.javascript.gen._cmd__4.exec(<cmd>)
at org.mozilla.javascript.Context.evaluateString(Context.java:1219)
at org.apache.jmeter.control.IfController$RhinoJsEngine.evaluate(IfController.java:105)
at org.apache.jmeter.control.IfController.evaluateCondition(IfController.java:187)
at org.apache.jmeter.control.IfController.next(IfController.java:240)
at org.apache.jmeter.control.GenericController.nextIsAController(GenericController.java:222)
at org.apache.jmeter.control.GenericController.next(GenericController.java:176)
at org.apache.jmeter.control.GenericController.nextIsAController(GenericController.java:222)
at org.apache.jmeter.control.GenericController.next(GenericController.java:176)
at org.apache.jmeter.control.LoopController.next(LoopController.java:123)
at org.apache.jmeter.control.GenericController.nextIsAController(GenericController.java:222)
at org.apache.jmeter.control.GenericController.next(GenericController.java:176)
at org.apache.jmeter.control.LoopController.next(LoopController.java:123)
at org.apache.jmeter.threads.AbstractThreadGroup.next(AbstractThreadGroup.java:87)
at org.apache.jmeter.threads.JMeterThread.run(JMeterThread.java:247)
at java.lang.Thread.run(Thread.java:745)
我是新来的jmeter，所以我猜我在这里失去了一些东西。任何帮助，将不胜感激。