you need to add remote and revision.

like :
this is remote : <remote name="la"
                  fetch="https://github.com/luandroid/" /> 

on repo like this :
  <project path="vendor/luandroid" name="android_vendor_luandroid" remote="la" revision="cm-10.1" />
Merge pull request #1 from aways/patch-1

you need to add remote and revision.