I am trying to install Symfony 2.1.3 (latest). I am running composer and installs everything okay. The only error that I get is:
Script Sens
I had this same issue for a while and after hours of face to brick wall pounding I realized... I have a .gitmodule in my project, and on initial checkout these submodules are NOT initialized and as such are not there for your composer to update, which results in the above error.
Make sure you run the following
git submodule update --init src/Acme/Sadness/Bundle
of course replace src/Acme/Sadness/Bundle with YOUR project namespace.
Hope this helps someone not go through the same pain I just did.