eclipse 启动项目出现错误

 !SUBENTRY 1 org.eclipse.equinox.registry 4 1 2013-08-22 16:42:38.343

!MESSAGE Plug-in "org.eclipse.equinox.p2.ui.sdk.scheduler" was unable to instantiate class "org.eclipse.equinox.internal.p2.ui.sdk.scheduler.AutomaticUpdateScheduler".

!STACK 0

java.lang.NullPointerException

	at org.eclipse.equinox.internal.p2.ui.sdk.scheduler.AutomaticUpdateScheduler.<init>(AutomaticUpdateScheduler.java:68)

	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

	at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)

	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)

	at java.lang.reflect.Constructor.newInstance(Unknown Source)

	at java.lang.Class.newInstance0(Unknown Source)

	at java.lang.Class.newInstance(Unknown Source)

	at org.eclipse.core.internal.registry.osgi.RegistryStrategyOSGI.createExecutableExtension(RegistryStrategyOSGI.java:184)

	at org.eclipse.core.internal.registry.ExtensionRegistry.createExecutableExtension(ExtensionRegistry.java:905)

	at org.eclipse.core.internal.registry.ConfigurationElement.createExecutableExtension(ConfigurationElement.java:243)

	at org.eclipse.core.internal.registry.ConfigurationElementHandle.createExecutableExtension(ConfigurationElementHandle.java:55)

	at org.eclipse.ui.internal.WorkbenchPlugin$1.run(WorkbenchPlugin.java:273)

	at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:52)

	at org.eclipse.ui.internal.WorkbenchPlugin.createExtension(WorkbenchPlugin.java:269)

	at org.eclipse.ui.internal.EarlyStartupRunnable.getExecutableExtension(EarlyStartupRunnable.java:117)

	at org.eclipse.ui.internal.EarlyStartupRunnable.run(EarlyStartupRunnable.java:66)

	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)

	at org.eclipse.ui.internal.Workbench$54.run(Workbench.java:2412)

	at org.eclipse.core.internal.jobs.Worker.run(Worker.java:53)



!ENTRY org.eclipse.core.jobs 2 2 2013-08-22 16:42:38.890

!MESSAGE Job found still running after platform shutdown.  Jobs should be canceled by the plugin that scheduled them during shutdown: org.eclipse.ui.internal.ide.IDEWorkbenchActivityHelper$4

还有很多类似的错误。这个是怎么回事啊
------解决方案--------------------
你好，我现在mac上也遇到这样的问题了，没有找到解决方法， 麻烦问一下，具体要怎么修改。 谢谢！