eclipse问题（!MESSAGE Unhandled event loop exception !STACK 0 java.lang.NullPointerException at org.e）

!MESSAGE Unhandled event loop exception

!STACK 0

java.lang.NullPointerException

at org.eclipse.swt.widgets.Control.internal_new_GC(Control.java:2118)

at org.eclipse.swt.graphics.GC.cocoa_new(GC.java:207)

at org.eclipse.swt.widgets.Tree.sendMeasureItem(Tree.java:2613)

at org.eclipse.swt.widgets.Tree.cellSize(Tree.java:288)

at org.eclipse.swt.widgets.Display.windowProc(Display.java:5528)

at org.eclipse.swt.internal.cocoa.OS.objc_msgSendSuper_stret(Native Method)

at org.eclipse.swt.widgets.Widget.expansionFrameWithFrame_inView(Widget.java:798)

at org.eclipse.swt.widgets.Tree.expansionFrameWithFrame_inView(Tree.java:1283)

at org.eclipse.swt.widgets.Display.windowProc(Display.java:5907)

at org.eclipse.swt.internal.cocoa.OS.objc_msgSend_bool(Native Method)

at org.eclipse.swt.internal.cocoa.NSRunLoop.runMode(NSRunLoop.java:42)

at org.eclipse.swt.widgets.Display.sleep(Display.java:4691)

at org.eclipse.ui.application.WorkbenchAdvisor.eventLoopIdle(WorkbenchAdvisor.java:368)

at com.appcelerator.titanium.rcp.IDEWorkbenchAdvisor.eventLoopIdle(IDEWorkbenchAdvisor.java:908)

at org.eclipse.ui.internal.Workbench$3.eventLoopIdle(Workbench.java:498)

at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$9.run(PartRenderingEngine.java:1155)

at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)

at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1032)

at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:148)

at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:636)

at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)

at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:579)

at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:150)

at com.appcelerator.titanium.rcp.IDEApplication.start(IDEApplication.java:126)

at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)

at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:134)

at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:104)

at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:380)

at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:235)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:606)

at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:648)

at org.eclipse.equinox.launcher.Main.basicRun(Main.java:603)

at org.eclipse.equinox.launcher.Main.run(Main.java:1465)

at org.eclipse.equinox.launcher.Main.main(Main.java:1438)