Eclipse crashed and won't restart. I don't understand the stack trace

Question

Eclipse crashed and won't restart. Can someone help me understand what the problem is? The message from the log is below. I am on Win7 and develop with Android SDKand I recently installed subclipse svn Thank you very much

    !ENTRY org.eclipse.core.resources 4 566 2012-01-24 15:15:54.500
!MESSAGE Cannot set lower sequence number for root (previous: 178, new: 177). Ignoring the new value.
!STACK 0
java.lang.IllegalArgumentException: Cannot set lower sequence number for root (previous: 178, new: 177). Ignoring the new value.
at org.eclipse.core.internal.resources.SaveManager$MasterTable.put(SaveManager.java:50)
at java.util.Properties.load0(Unknown Source)
at java.util.Properties.load(Unknown Source)
at org.eclipse.core.internal.resources.SaveManager.restoreMasterTable(SaveManager.java:829)
at org.eclipse.core.internal.resources.SaveManager.restore(SaveManager.java:684)
at org.eclipse.core.internal.resources.SaveManager.startup(SaveManager.java:1527)
at org.eclipse.core.internal.resources.Workspace.startup(Workspace.java:2503)
at org.eclipse.core.internal.resources.Workspace.open(Workspace.java:2251)
at org.eclipse.core.resources.ResourcesPlugin.start(ResourcesPlugin.java:439)
at org.eclipse.osgi.framework.internal.core.BundleContextImpl$1.run(BundleContextImpl.java:711)
at java.security.AccessController.doPrivileged(Native Method)
at org.eclipse.osgi.framework.internal.core.BundleContextImpl.startActivator(BundleContextImpl.java:702)
at org.eclipse.osgi.framework.internal.core.BundleContextImpl.start(BundleContextImpl.java:683)
at org.eclipse.osgi.framework.internal.core.BundleHost.startWorker(BundleHost.java:381)
at org.eclipse.osgi.framework.internal.core.AbstractBundle.start(AbstractBundle.java:299)
at org.eclipse.osgi.framework.util.SecureAction.start(SecureAction.java:440)
at org.eclipse.osgi.internal.loader.BundleLoader.setLazyTrigger(BundleLoader.java:268)
at org.eclipse.core.runtime.internal.adaptor.EclipseLazyStarter.postFindLocalClass(EclipseLazyStarter.java:107)
at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClass(ClasspathManager.java:462)
at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.findLocalClass(DefaultClassLoader.java:216)
at org.eclipse.osgi.internal.loader.BundleLoader.findLocalClass(BundleLoader.java:400)
at     org.eclipse.osgi.internal.loader.SingleSourcePackage.loadClass(SingleSourcePackage.java:35)
at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:473)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:429)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:417)
at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:107)
at java.lang.ClassLoader.loadClass(Unknown Source)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:124)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:344)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)
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.equinox.launcher.Main.invokeFramework(Main.java:622)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:577)
at org.eclipse.equinox.launcher.Main.run(Main.java:1410)
at org.eclipse.equinox.launcher.Main.main(Main.java:1386)

Answer 1

Delete the file .metadata/.plugins/org.eclipse.core.resources/.snap

Answer 2

I usually move my .metadata folder, restart eclipse (which will recreate the .metadata folder), import existing projects and then shutdown eclipse and restore following folders from the old .metadata to the new:

.metadata\.plugins\:

• org.eclipse.core.runtime
• org.eclipse.debug.core
• org.eclipse.debug.ui
• org.eclipse.search
• org.eclipse.ui.workbench
• org.eclipse.ui.workbench.texteditor
• org.tigris.subversion.subclipse.ui

This will restore a lot of settings you had before and save you some time to reset them. This list is not exhaustive, there are more settings folders that could be restored but for me these were the most useful ones.

Answer 3

Try deleting (or moving) the .metadata folder from your Workspace and see if it fix this.

Answer 4

For anyone interested, I had the exact same problem and deleting the file .metadata/.plugins/org.eclipse.core.resources/.snap did the trick for me.