error when I install git-emacs

[stardiviner]

Debugger entered--Lisp error: (wrong-type-argument stringp nil)
string-to-char(nil)
git--status-index("init.el")
git--status-file("init.el")
git--update-modeline()
ad-Advice-vc-find-file-hook(#[nil "�\203�

Symbol's function definition is void: git--uninstall-state-mark-modeline