$ gitbook init
Installing GitBook 2.4.2
Error: Command failed: git -c core.longpaths=true clone --template=F:\node\node_cache\_git-remotes\_templates --mirror git://github.com/anthonny/opal-npm-wrapper.git F:\node\node_cache\_git-remotes\git-github-com-anthonny-opal-npm-wrapper-git-1727a7b3
Cloning into bare repository 'F:\node\node_cache\_git-remotes\git-github-com-anthonny-opal-npm-wrapper-git-1727a7b3'...
fatal: unable to connect to github.com:
github.com[0: 192.30.252.129]: errno=No error
错误 该怎么办呀 求大神指导一下