前段时间都可以打开帮助文档的，今天想查点资料，输入helpdesk以后就出现下面的一些错误：

>> helpdesk

java.lang.NullPointerException

at javax.swing.border.EmptyBorder.(Unknown Source)

at com.sun.java.swing.plaf.windows.WindowsTableHeaderUI$XPDefaultRenderer.getTableCellRendererComponent(Unknown Source)

at com.mathworks.mwswing.table.SortedTableHeaderRenderer.getTableCellRendererComponent(SortedTableHeaderRenderer.java:129)

at javax.swing.plaf.basic.BasicTableHeaderUI.getHeaderRenderer(Unknown Source)

at javax.swing.plaf.basic.BasicTableHeaderUI.getHeaderHeight(Unknown Source)

at javax.swing.plaf.basic.BasicTableHeaderUI.createHeaderSize(Unknown Source)

at javax.swing.plaf.basic.BasicTableHeaderUI.getPreferredSize(Unknown Source)

at javax.swing.JComponent.getPreferredSize(Unknown Source)

at javax.swing.ViewportLayout.preferredLayoutSize(Unknown Source)

at java.awt.Container.preferredSize(Unknown Source)

at java.awt.Container.getPreferredSize(Unknown Source)

at javax.swing.JComponent.getPreferredSize(Unknown Source)

at javax.swing.ScrollPaneLayout.layoutContainer(Unknown Source)

at java.awt.Container.layout(Unknown Source)

at java.awt.Container.doLayout(Unknown Source)

at java.awt.Container.validateTree(Unknown Source)

at java.awt.Container.validateTree(Unknown Source)

at java.awt.Container.validateTree(Unknown Source)

at java.awt.Container.validateTree(Unknown Source)

at java.awt.Container.validateTree(Unknown Source)

at java.awt.Container.validateTree(Unknown Source)

at java.awt.Container.validateTree(Unknown Source)

at java.awt.Container.validateTree(Unknown Source)

at java.awt.Container.validateTree(Unknown Source)

at java.awt.Container.validateTree(Unknown Source)

at java.awt.Container.validateTree(Unknown Source)

at java.awt.Container.validateTree(Unknown Source)

at java.awt.Container.validateTree(Unknown Source)

at java.awt.Container.validateTree(Unknown Source)

at java.awt.Container.validateTree(Unknown Source)

at java.awt.Container.validate(Unknown Source)

at java.awt.Window.show(Unknown Source)

at com.mathworks.mwswing.MJFrame.show(MJFrame.java:550)

at java.awt.Component.show(Unknown Source)

at java.awt.Component.setVisible(Unknown Source)

at com.mathworks.mwswing.MJFrame.setVisible(MJFrame.java:580)

at com.mathworks.mwswing.desk.DTSingleClientFrame.setVisible(DTSingleClientFrame.java:270)

at com.mathworks.mwswing.desk.Desktop.setClientShowing(Desktop.java:2774)

at com.mathworks.mwswing.desk.Desktop$DeferredCall.run(Desktop.java:3394)

at java.awt.event.InvocationEvent.dispatch(Unknown Source)

at java.awt.EventQueue.dispatchEvent(Unknown Source)

at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)

at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)

at java.awt.EventDispatchThread.pumpEvents(Unknown Source)

at java.awt.EventDispatchThread.pumpEvents(Unknown Source)

at java.awt.EventDispatchThread.run(Unknown Source)

java.lang.NullPointerException

at javax.swing.border.EmptyBorder.(Unknown Source)

at com.sun.java.swing.plaf.windows.WindowsTableHeaderUI$XPDefaultRenderer.getTableCellRendererComponent(Unknown Source)

at com.mathworks.mwswing.table.SortedTableHeaderRenderer.getTableCellRendererComponent(SortedTableHeaderRenderer.java:129)

at javax.swing.plaf.basic.BasicTableHeaderUI.getHeaderRenderer(Unknown Source)

at javax.swing.plaf.basic.BasicTableHeaderUI.getHeaderHeight(Unknown Source)

at javax.swing.plaf.basic.BasicTableHeaderUI.createHeaderSize(Unknown Source)

at javax.swing.plaf.basic.BasicTableHeaderUI.getPreferredSize(Unknown Source)

at javax.swing.JComponent.getPreferredSize(Unknown Source)

at javax.swing.ViewportLayout.preferredLayoutSize(Unknown Source)

at java.awt.Container.preferredSize(Unknown Source)

at java.awt.Container.getPreferredSize(Unknown Source)

at javax.swing.JComponent.getPreferredSize(Unknown Source)

at javax.swing.ScrollPaneLayout.layoutContainer(Unknown Source)

at java.awt.Container.layout(Unknown Source)

at java.awt.Container.doLayout(Unknown Source)

at java.awt.Container.validateTree(Unknown Source)

at java.awt.Container.validateTree(Unknown Source)

at java.awt.Container.validateTree(Unknown Source)

at java.awt.Container.validateTree(Unknown Source)

at java.awt.Container.validateTree(Unknown Source)

at java.awt.Container.validateTree(Unknown Source)

at java.awt.Container.validateTree(Unknown Source)

at java.awt.Container.validateTree(Unknown Source)

at java.awt.Container.validateTree(Unknown Source)

at java.awt.Container.validateTree(Unknown Source)

at java.awt.Container.validateTree(Unknown Source)

at java.awt.Container.validateTree(Unknown Source)

at java.awt.Container.validateTree(Unknown Source)

at java.awt.Container.validateTree(Unknown Source)

at java.awt.Container.validateTree(Unknown Source)

at java.awt.Container.validate(Unknown Source)

at java.awt.Window.dispatchEventImpl(Unknown Source)

at java.awt.Component.dispatchEvent(Unknown Source)

at java.awt.EventQueue.dispatchEvent(Unknown Source)

at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)

at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)

at java.awt.EventDispatchThread.pumpEvents(Unknown Source)

at java.awt.EventDispatchThread.pumpEvents(Unknown Source)

at java.awt.EventDispatchThread.run(Unknown Source)、

各位兄弟有没有遇到这种情况，是哪里的错误呢？路径吗或者是环境变量的问题，