I installed Vundle via the instructions given at this blog http://web.archive.org/web/20120731003342/http://www.charlietanksley.net/philtex/sane-vim-plugin-management
bu
I just met the problem and I resolved it after reading
https://github.com/gmarik/vundle/issues/168
It says.
This might happen if you call the vi editor explicitly (to avoid any aliases) by /usr/bin/vi instead of vim. A plain "git commit" would do this for me before I configured it to use vim instead. (git config --global core.editor "vim")