IOS CocoaPods: getting error while installing webSocket

I downloaded the WebSocket SDK for ios, https://github.com/elabs/mobile-websocket-example

Now when I tried to install cocoa pods I got the following error

Analyzing dependencies
[!] An error occurred while performing `git pull` on repo `master`.
[!] /usr/bin/git pull --ff-only

error: RPC failed; result=56, HTTP code = 200

fatal: The remote end hung up unexpectedly

fatal: early EOF

fatal: index-pack failed

      

        
        
        
      

    

Please help me with this.

Thank.