報錯詳情：
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at com.mathworks.toolbox.opc.ServerNamespaceClient.addNodesToTree(ServerNamespaceClient.java:905)
at com.mathworks.toolbox.opc.ServerNamespaceClient.updateSNSTree(ServerNamespaceClient.java:991)
at com.mathworks.toolbox.opc.ServerNamespaceClient.updateGuiSNSFn(ServerNamespaceClient.java:999)
at com.mathworks.toolbox.opc.ServerNamespaceClient.access$200(ServerNamespaceClient.java:25)
at com.mathworks.toolbox.opc.ServerNamespaceClient$Guisnsfn.matlabEvent(ServerNamespaceClient.java:1272)
at com.mathworks.jmi.MatlabMCR$AWTReplyEvent.run(MatlabMCR.java:1718)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:756)
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:80)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:726)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
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)
按照MathWork官網的OPC DA檔案操作，
卡在了第7步，Simulation Items下邊的子選項都展不開，一點就報上邊的錯誤，DA也卡住了。
網上MATLAB報Java錯誤的很多，我試過修改matlab.prf但是沒管用。
求幫助，謝謝。
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