Mac系统SoapUI 5.5无法启动求助：多种方案尝试后仍报错

大概一个月前，我的Mac设备上的SoapUI突然无法启动了。我已经尝试了各种排查方案，但所有方法都无效：

• 更换不同版本的JRE
• 修改info.plist文件
• 调整vmoptions配置
• 卸载重装超过20次，还试过多个旧版本

每次启动都会抛出如下错误：

Exception in thread "AWT-EventQueue-0" java.lang.NoSuchMethodError: org.apache.commons.io.FilenameUtils.normalize(Ljava/lang/String;)Ljava/lang/String;
 at com.eviware.soapui.DefaultSoapUICore.getRoot(DefaultSoapUICore.java:227)
 at com.eviware.soapui.DefaultSoapUICore.loadExternalLibraries(DefaultSoapUICore.java:511)
 at com.eviware.soapui.DefaultSoapUICore.init(DefaultSoapUICore.java:140)
 at com.eviware.soapui.DefaultSoapUICore.<init>(DefaultSoapUICore.java:126)
 at com.eviware.soapui.DefaultSoapUICore.createDefault(DefaultSoapUICore.java:105)
 at com.eviware.soapui.SoapUI.getSettings(SoapUI.java:1699)
 at com.eviware.soapui.SoapUI$SoapUIRunner.run(SoapUI.java:792)
 at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)
 at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)
 at java.awt.EventQueue.access$500(EventQueue.java:97)
 at java.awt.EventQueue$3.run(EventQueue.java:709)
 at java.awt.EventQueue$3.run(EventQueue.java:703)
 at java.security.AccessController.doPrivileged(Native Method)
 at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:74)
 at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)
 at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:205)
 at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
 at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
 at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
 at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
 at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)

恳请各位技术大佬帮忙分析一下问题所在，给出可行的解决办法，非常感谢！

内容的提问来源于stack exchange，提问作者user3003384