How to avoid soapUI exceptions during startup?

I have similar thing, my soapUI is 5.3.0, my machine is Mac OS Mojave.  I used to be able to start up soapUI, but I cannot now.

I follow the above suggestion to move the plugin jars from gchen/.soapuios/plugins directory to soapUI5.3.0/Content/java/app/bin/ext directory and I still cannot start up soapUI.

The soapUI-errors.log has following errors:

ERROR [errorlog] java.lang.ClassNotFoundException: com.eviware.soapui.plugins.auto.factories.AutoDiscoveryMethodFactory
java.lang.ClassNotFoundException: com.eviware.soapui.plugins.auto.factories.AutoDiscoveryMethodFactory
at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:190)
at com.eviware.soapui.plugins.LoaderBase.loadAutoFactories(LoaderBase.java:112)
at com.eviware.soapui.plugins.LoaderBase.loadFactories(LoaderBase.java:80)
at com.eviware.soapui.plugins.PluginLoader.loadPluginFactories(PluginLoader.java:141)
at com.eviware.soapui.plugins.PluginLoader.loadPlugin(PluginLoader.java:104)
at com.eviware.soapui.plugins.PluginLoader.loadPlugin(PluginLoader.java:54)
at com.eviware.soapui.plugins.PluginManager.doInstallPlugin(PluginManager.java:141)
at com.eviware.soapui.plugins.PluginManager.access$600(PluginManager.java:43)
at com.eviware.soapui.plugins.PluginManager$LoadPluginsTask.computeSequentially(PluginManager.java:420)
at com.eviware.soapui.plugins.PluginManager$LoadPluginsTask.compute(PluginManager.java:377)
at com.eviware.soapui.plugins.PluginManager$LoadPluginsTask.compute(PluginManager.java:382)
at com.eviware.soapui.plugins.PluginManager$LoadPluginsTask.compute(PluginManager.java:365)
at java.util.concurrent.RecursiveTask.exec(RecursiveTask.java:93)
at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:334)
at java.util.concurrent.ForkJoinWorkerThread.execTask(ForkJoinWorkerThread.java:604)
at java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:784)
at java.util.concurrent.ForkJoinPool.work(ForkJoinPool.java:646)
at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:398)

Any suggestion how to fix it?

Thanks a lot !