eclipse 打开的时候弹出 'Building workspace' has encountered a problem. Errors occurred during ....

Errors occurred during the build.
Error instantiating builder 'com.android.ide.eclipse.adt.ResourceManagerBuilder'.
Plug-in com.android.ide.eclipse.adt was unable to load class com.android.ide.eclipse.adt.internal.build.builders.ResourceManagerBuilder.
An error occurred while automatically activating bundle com.android.ide.eclipse.adt (2).
Plug-in com.android.ide.eclipse.adt was unable to load class com.android.ide.eclipse.adt.internal.build.builders.ResourceManagerBuilder.
An error occurred while automatically activating bundle com.android.ide.eclipse.adt (2).
Error instantiating builder 'com.android.ide.eclipse.adt.PreCompilerBuilder'.
Plug-in com.android.ide.eclipse.adt was unable to load class com.android.ide.eclipse.adt.internal.build.builders.PreCompilerBuilder.
An error occurred while automatically activating bundle com.android.ide.eclipse.adt (2).
Plug-in com.android.ide.eclipse.adt was unable to load class com.android.ide.eclipse.adt.internal.build.builders.PreCompilerBuilder.
An error occurred while automatically activating bundle com.android.ide.eclipse.adt (2).
Error instantiating builder 'com.android.ide.eclipse.adt.ApkBuilder'.
Plug-in com.android.ide.eclipse.adt was unable to load class com.android.ide.eclipse.adt.internal.build.builders.PostCompilerBuilder.
An error occurred while automatically activating bundle com.android.ide.eclipse.adt (2).
Plug-in com.android.ide.eclipse.adt was unable to load class com.android.ide.eclipse.adt.internal.build.builders.PostCompilerBuilder.
An error occurred while automatically activating bundle com.android.ide.eclipse.adt (2).

这是编译工作空间不足。

可以将一些暂时不用的项目，右键-close，关掉。

另外可以清理电脑空间，具体操作如下：

1、在官网下载安装驱动程序，避免第三方软件更新的驱动不兼容使空间不足。

2、查看控制面板---程序---卸载---是否有安装一些不需要的软件或类似软件，如果杀毒软件或优化软件有多个，可以卸载，只保留一个。

3、建议关闭部分启动项：开始---运行---msconfig,一些不重要的启动项、或第三方软件程序前面的“勾选”去掉取消。

4、系统方面，建议使用预装系统或纯净版系统，避免ghost版本系统兼容性和稳定性不是很好。