当我使用命令时:easy_install观察器要安装spotter包，我收到以下错误消息SearchingforspotterReadinghttp://pypi.python.org/simple/spotter/Downloaderroronhttp://pypi.python.org/simple/spotter/:[Errno11001]getaddrinfofailed--Somepackagesmaynotbefound!Readinghttp://pypi.python.org/simple/spotter/Downloaderroronhttp://pypi.pytho