git报错---If no other git process is currently running...

今天帮同事上传一个代码（预生产环境），当我执行到git add 文件 的时候，出现了如下错误：

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.

网上查了好多文章，总结一下，方便以后查看，以下是解决方案：

rm -f ./.git/index.lockbi

编译ICS时出现以下错误：

build/core/Java.mk:20: * dalvik/dexgen: Invalid LOCAL_SDK_VERSION ‘4’ Choices are: current . Stop.

解决方法：

rm -rf prebuilt ; repo sync prebuilt