今天提交代碼時，在一次提交，莫名其妙沒成功後，再次用git commit -a命令時，出現以下錯誤，無論是用git還是TortoiseGit都會出現以下這個問題。。
$ git commit -a
fatal: Unable to create 'e:/git/Android/XXXXXX/.git/index.lock': File e
xists.
If no other git process is currently running, this probably means a
git process crashed in this repository earlier. Make sure no other git
process is running and remove the file manually to continue.
解決辦法：找到index.lock 刪除即可