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我在Windows 7 Ultimate上运行Eclipse Indigo时遇到错误.对于以下每个项目:

Android SDK content loader
Building workspace
Initializing Java Tooling
Loading data for Android 2.3.3
Loading data for Android 4.03

抛出此错误:

 An internal error occurred during: "Initializing Java Tooling".java.lang.NullPointerException

我该怎么办？