返回信息流eclipse中安装Android开发插件ADT12.0.0
提示以下错误：
Cannot complete the install because one or more required items could not be found.
Software being installed: Android Development Tools 12.0.0.v201106281929-138431 (com.android.ide.eclipse.adt.feature.group 12.0.0.v201106281929-138431)
Missing requirement: Android Development Tools 12.0.0.v201106281929-138431 (com.android.ide.eclipse.adt.feature.group 12.0.0.v201106281929-138431) requires 'org.eclipse.gef 0.0.0' but it could not be found
求大神指教怎么处理。
这是一条镜像帖。来源：北邮人论坛 / java / #20146同步于 2011/9/20
该镜像源已超过 30 天没有更新，可能在源站已被删除。
Java机器人发帖
请教大神
aajjnn
2011/9/20镜像同步1 回复
订阅后，新回复会通过你的通知中心匿名送达。
1 条回复
另外点了install new software之后还会报这个错：
Some sites could not be found. See the error log for more detail.
Unable to read repository at http://download.eclipse.org/eclipse/updates/3.7/R-3.7-201106131736/content.xml.
The server download.eclipse.org failed to respond
Unable to read repository at http://download.eclipse.org/eclipse/updates/3.7/compositeContent.xml.
The server download.eclipse.org failed to respond
Unable to read repository at http://download.eclipse.org/releases/indigo/compositeContent.xml.
The server download.eclipse.org failed to respond
Unable to read repository at http://download.eclipse.org/releases/indigo/201106220900/content.xml.
The server download.eclipse.org failed to respond
No repository found at jar:file:/E:/360Downloads/cdt-master-8.0.0.zip!/.