创建Android项目时layout无法显示，报This version of the rendering library is more recent than your version of ADT plug-in. Please update ADT plug-in。然后用这个https://dl-ssl.google.com/and...更新，会显示这个

Cannot complete the request.  See the error log for details.
"Android Traceview" will be ignored because a newer version is already installed. 
"Android Hierarchy Viewer" will be ignored because a newer version is already installed. 
"Android Development Tools" will be ignored because a newer version is already installed. 
"Tracer for OpenGL ES" will be ignored because a newer version is already installed. 
"Android Native Development Tools" will be ignored because a newer version is already installed. 
"Android DDMS" will be ignored because a newer version is already installed. 

这是什么原因啊，谢谢了。