Cargo install mdbook failure

[karl-cenliming]

when I following the readme first git clone the repository to local. then in the local path I opend a cmd to install mdbook
when I run the command : cargo install mdbook it returned following error

I know this should not the code error, but as a new rustacean,could anyone help me on this.
thanks

[AllenDEricDAlexander]

You can solve this by switching sources. High probability network problems