jettyLauncher出错,请大家帮帮忙

我把jettyLauncher里的东西都放到eclipse下去了,启动eclipse也可以看的到jetty,但new了一个jetty web之后保存了却会出现错误,然后就再也不能NEW了.要把workspace下的.metadata文件夹删掉重启才能new,但new了一个以后又出错,我想问下该怎么解决啊.log里报的错误如下:
!SESSION 2008-03-13 00:18:41.125 -----------------------------------------------
eclipse.buildId=M20060629-1905
java.version=1.5.0
java.vendor=Sun Microsystems Inc.
BootLoader constants: OS=win32, ARCH=x86, WS=win32, NL=zh_CN
Command-line arguments:  -os win32 -ws win32 -arch x86!ENTRY org.eclipse.jface 4 2 2008-03-13 00:22:12.984
!MESSAGE Problems occurred when invoking code from plug-in: "org.eclipse.jface".
!STACK 0
org.eclipse.core.runtime.AssertionFailedException: assertion failed: Path for IClasspathEntry must be absolute
at org.eclipse.core.runtime.Assert.isTrue(Assert.java:109)
at org.eclipse.jdt.core.JavaCore.newLibraryEntry(JavaCore.java:3384)
at org.eclipse.jdt.core.JavaCore.newLibraryEntry(JavaCore.java:3274)
at org.eclipse.jdt.launching.JavaRuntime.newArchiveRuntimeClasspathEntry(JavaRuntime.java:602)
at com.iw.plugins.jetty.launcher.JettyClasspathProvider.setupJettyPaths(JettyClasspathProvider.java:191)
at com.iw.plugins.jetty.launcher.JettyClasspathProvider.computeUnresolvedClasspath(JettyClasspathProvider.java:82)
at org.eclipse.jdt.internal.launching.RuntimeClasspathProvider.computeUnresolvedClasspath(RuntimeClasspathProvider.java:53)
at org.eclipse.jdt.launching.JavaRuntime.computeUnresolvedRuntimeClasspath(JavaRuntime.java:1168)
at org.eclipse.jdt.debug.ui.launchConfigurations.JavaClasspathTab.createClasspathModel(JavaClasspathTab.java:252)
at org.eclipse.jdt.debug.ui.launchConfigurations.JavaClasspathTab.refresh(JavaClasspathTab.java:240)
at org.eclipse.jdt.debug.ui.launchConfigurations.JavaClasspathTab.initializeFrom(JavaClasspathTab.java:195)
at org.eclipse.debug.ui.AbstractLaunchConfigurationTabGroup.initializeFrom(AbstractLaunchConfigurationTabGroup.java:86)
at org.eclipse.debug.internal.ui.launchConfigurations.LaunchConfigurationTabGroupViewer.displayInstanceTabs(LaunchConfigurationTabGroupViewer.java:655)
at org.eclipse.debug.internal.ui.launchConfigurations.LaunchConfigurationTabGroupViewer$6.run(LaunchConfigurationTabGroupViewer.java:548)
at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:67)
at org.eclipse.debug.internal.ui.launchConfigurations.LaunchConfigurationTabGroupViewer.inputChanged(LaunchConfigurationTabGroupViewer.java:565)
at org.eclipse.debug.internal.ui.launchConfigurations.LaunchConfigurationTabGroupViewer.setInput(LaunchConfigurationTabGroupViewer.java:529)
at org.eclipse.debug.internal.ui.launchConfigurations.LaunchConfigurationsDialog.handleLaunchConfigurationSelectionChanged(LaunchConfigurationsDialog.java:928)
at org.eclipse.debug.internal.ui.launchConfigurations.LaunchConfigurationsDialog$4.selectionChanged(LaunchConfigurationsDialog.java:547)
at org.eclipse.jface.viewers.StructuredViewer$3.run(StructuredViewer.java:839)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:37)
at org.eclipse.core.runtime.Platform.run(Platform.java:843)
at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:44)
at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:149)
at org.eclipse.jface.viewers.StructuredViewer.firePostSelectionChanged(StructuredViewer.java:837)
at org.eclipse.jface.viewers.StructuredViewer.setSelection(StructuredViewer.java:1578)
at org.eclipse.debug.internal.ui.launchConfigurations.LaunchConfigurationView.handleConfigurationAdded(LaunchConfigurationView.java:344)
at org.eclipse.debug.internal.ui.launchConfigurations.LaunchConfigurationView.launchConfigurationAdded(LaunchConfigurationView.java:319)
at org.eclipse.debug.internal.core.LaunchManager$ConfigurationNotifier.run(LaunchManager.java:199)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:37)
at org.eclipse.debug.internal.core.LaunchManager$ConfigurationNotifier.notify(LaunchManager.java:186)
at org.eclipse.debug.internal.core.LaunchManager.launchConfigurationAdded(LaunchManager.java:1729)
at org.eclipse.debug.internal.core.LaunchConfigurationWorkingCopy.writeNewFile(LaunchConfigurationWorkingCopy.java:241)
at org.eclipse.debug.internal.core.LaunchConfigurationWorkingCopy.doSave0(LaunchConfigurationWorkingCopy.java:196)
at org.eclipse.debug.internal.core.LaunchConfigurationWorkingCopy.doSave(LaunchConfigurationWorkingCopy.java:172)
at org.eclipse.debug.internal.ui.launchConfigurations.LaunchConfigurationTabGroupViewer.handleApplyPressed(LaunchConfigurationTabGroupViewer.java:1179)
at org.eclipse.debug.internal.ui.launchConfigurations.LaunchConfigurationTabGroupViewer$2.widgetSelected(LaunchConfigurationTabGroupViewer.java:296)
at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:90)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:928)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3348)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2968)
at org.eclipse.jface.window.Window.runEventLoop(Window.java:820)
at org.eclipse.jface.window.Window.open(Window.java:796)
at org.eclipse.debug.internal.ui.launchConfigurations.LaunchConfigurationsDialog.open(LaunchConfigurationsDialog.java:1086)
at org.eclipse.debug.ui.DebugUITools$1.run(DebugUITools.java:375)
at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:67)
at org.eclipse.debug.ui.DebugUITools.openLaunchConfigurationDialogOnGroup(DebugUITools.java:379)
at org.eclipse.debug.ui.DebugUITools.openLaunchConfigurationDialogOnGroup(DebugUITools.java:321)
at org.eclipse.debug.ui.actions.OpenLaunchDialogAction.run(OpenLaunchDialogAction.java:80)
at org.eclipse.jface.action.Action.runWithEvent(Action.java:499)
at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:539)
at org.eclipse.jface.action.ActionContributionItem.access$2(ActionContributionItem.java:488)
at org.eclipse.jface.action.ActionContributionItem$5.handleEvent(ActionContributionItem.java:400)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:928)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3348)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2968)
at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:1914)
at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:1878)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:419)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
at org.eclipse.ui.internal.ide.IDEApplication.run(IDEApplication.java:95)
at org.eclipse.core.internal.runtime.PlatformActivator$1.run(PlatformActivator.java:78)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:92)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:68)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:400)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:177)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.eclipse.core.launcher.Main.invokeFramework(Main.java:336)
at org.eclipse.core.launcher.Main.basicRun(Main.java:280)
at org.eclipse.core.launcher.Main.run(Main.java:977)
at org.eclipse.core.launcher.Main.main(Main.java:952)