What causes "fatal: The remote end hung up unxepctedly" when using git to try and clone a repository on github?

I'm trying to clone the facebook iOS API located on github.com. I'm new to git and I've just downloaded the git client. I also have created a github account. I thought I configured everything correctly but I'm running into the following 开发者_如何学Cerror:

Cloning into facebook-ios.sdk...

fatal: The remote end hung up unexpectedly

Any help is great. Thanks!

You have a typo. Use this:

git clone git://github.com/facebook/facebook-ios-sdk.git