Unable to create XXX/.git/index.lock‘: File exists. Another git process seems to be running in this

Unable to create XXX/.git/index.lock’: File exists. Another git process seems to be running in this
今天提交代码时，在一次提交，莫名其妙没成功后，再次用git commit -a命令时，出现以下错误，无论是用git还是TortoiseGit等其他客户端都会出现以下这个问题。。
打开项目目录 搜索.lock

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