我昨天安装了 PDT、ADT 和一些插件。今天早上，从帮助->检查更新更新后，我丢失了所有已安装的插件。新建项目向导中留下了“Generals”和“CVS”。
我查看了help->Install new software，安装向导显示，我安装的所有插件都已经安装了。
发生什么事？如何恢复已安装的插件？
==================================================== ===========================
更新
这是错误日志
!ENTRY org.eclipse.help.base 4 0 2013-05-08 17:01:56.363
!MESSAGE Problem occurred during indexing of documentation.
!STACK 0
java.lang.IllegalArgumentException: invalid format:
at org.osgi.framework.Version.<init>(Version.java:150)
at org.eclipse.help.internal.search.SearchIndex.isLuceneCompatible(SearchIndex.java:721)
at org.eclipse.help.internal.search.PluginIndex.isCompatible(PluginIndex.java:152)
at org.eclipse.help.internal.search.PluginIndex.resolve(PluginIndex.java:83)
at org.eclipse.help.internal.search.PluginIndex.getPaths(PluginIndex.java:231)
at org.eclipse.help.internal.search.PrebuiltIndexes.trim(PrebuiltIndexes.java:46)
at org.eclipse.help.internal.search.PrebuiltIndexes.getIndexes(PrebuiltIndexes.java:54)
at org.eclipse.help.internal.search.IndexingOperation.mergeIndexes(IndexingOperation.java:544)
at org.eclipse.help.internal.search.IndexingOperation.addNewDocuments(IndexingOperation.java:152)
at org.eclipse.help.internal.search.IndexingOperation.execute(IndexingOperation.java:106)
at org.eclipse.help.internal.search.LocalSearchManager.updateIndex(LocalSearchManager.java:671)
at org.eclipse.help.internal.search.LocalSearchManager.ensureIndexUpdated(LocalSearchManager.java:645)
at org.eclipse.help.internal.search.LocalSearchManager.search(LocalSearchManager.java:590)
at org.eclipse.help.internal.search.SearchManager.searchLocal(SearchManager.java:103)
at org.eclipse.help.internal.search.SearchManager.search(SearchManager.java:94)
at org.eclipse.help.internal.search.SearchProgressMonitor$2.run(SearchProgressMonitor.java:162)
at java.lang.Thread.run(Thread.java:679)
Caused by: java.util.NoSuchElementException
at java.util.StringTokenizer.nextToken(StringTokenizer.java:349)
at org.osgi.framework.Version.<init>(Version.java:127)
... 16 more