我有一个在 2.8 版本的 jmeter 中可以正常工作（打开并运行）的脚本。我刚刚下载了 Jmeter 2.9，但无法打开此脚本。
我在日志文件中收到以下错误，我似乎不明白 DummySampler 的问题是什么，这似乎是日志中错误的根源。我检查了 2.9 版本更改日志页面http://jmeter.apache.org/changes.html并没有找到任何相关内容。
我是 Jmeter 和 Java 的新手，感谢任何帮助！
2013/08/05 17:12:29 INFO - jmeter.save.SaveService: All converter versions present and correct
2013/08/05 17:12:30 ERROR - jmeter.save.SaveService: Conversion error com.thoughtworks.xstream.converters.ConversionException: kg.apc.jmeter.samplers.DummySampler : kg.apc.jmeter.samplers.DummySampler
---- Debugging information ----
message : kg.apc.jmeter.samplers.DummySampler
cause-exception : com.thoughtworks.xstream.mapper.CannotResolveClassException
cause-message : kg.apc.jmeter.samplers.DummySampler
class : org.apache.jorphan.collections.ListedHashTree
required-type : org.apache.jorphan.collections.ListedHashTree
converter-type : org.apache.jmeter.save.converters.HashTreeConverter
path : /jmeterTestPlan/hashTree/hashTree/hashTree[7]/hashTree[6]/kg.apc.jmeter.samplers.DummySampler
line number : 416
------------------------------- : kg.apc.jmeter.samplers.DummySampler : kg.apc.jmeter.samplers.DummySampler
---- Debugging information ----
message : kg.apc.jmeter.samplers.DummySampler
cause-exception : com.thoughtworks.xstream.mapper.CannotResolveClassException
cause-message : kg.apc.jmeter.samplers.DummySampler
class : org.apache.jorphan.collections.ListedHashTree
required-type : org.apache.jorphan.collections.ListedHashTree
converter-type : org.apache.jmeter.save.converters.HashTreeConverter
path : /jmeterTestPlan/hashTree/hashTree/hashTree[7]/hashTree[6]/kg.apc.jmeter.samplers.DummySampler
line number : 416
-------------------------------
message : kg.apc.jmeter.samplers.DummySampler : kg.apc.jmeter.samplers.DummySampler
---- Debugging information ----
message : kg.apc.jmeter.samplers.DummySampler
cause-exception : com.thoughtworks.xstream.mapper.CannotResolveClassException
cause-message : kg.apc.jmeter.samplers.DummySampler
class : org.apache.jorphan.collections.ListedHashTree
required-type : org.apache.jorphan.collections.ListedHashTree
converter-type : org.apache.jmeter.save.converters.HashTreeConverter
path : /jmeterTestPlan/hashTree/hashTree/hashTree[7]/hashTree[6]/kg.apc.jmeter.samplers.DummySampler
line number : 416
-------------------------------
cause-exception : com.thoughtworks.xstream.converters.ConversionException
cause-message : kg.apc.jmeter.samplers.DummySampler : kg.apc.jmeter.samplers.DummySampler
first-jmeter-class : org.apache.jmeter.save.converters.HashTreeConverter.unmarshal(HashTreeConverter.java:65)
class : org.apache.jmeter.save.ScriptWrapper
required-type : org.apache.jorphan.collections.ListedHashTree
converter-type : org.apache.jmeter.save.ScriptWrapperConverter
path : /jmeterTestPlan/hashTree/hashTree/hashTree[7]/hashTree[6]/kg.apc.jmeter.samplers.DummySampler
line number : 416
version : 2.9 r1437961
-------------------------------
2013/08/05 17:12:30 WARN - jmeter.gui.action.Load: Unexpected error java.lang.Exception: Error in TestPlan - see log file
at org.apache.jmeter.gui.action.Load.insertLoadedTree(Load.java:158)
at org.apache.jmeter.gui.action.Load.loadProjectFile(Load.java:113)
at org.apache.jmeter.gui.action.Load.doAction(Load.java:92)
at org.apache.jmeter.gui.action.ActionRouter.performAction(ActionRouter.java:81)
at org.apache.jmeter.gui.action.ActionRouter.access$000(ActionRouter.java:40)
at org.apache.jmeter.gui.action.ActionRouter$1.run(ActionRouter.java:63)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:715)
at java.awt.EventQueue.access$400(EventQueue.java:82)
at java.awt.EventQueue$2.run(EventQueue.java:676)
at java.awt.EventQueue$2.run(EventQueue.java:674)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:86)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:685)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:296)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:211)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:196)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:188)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)