# Bison's collection of solutions to common Git errors

Language: en
Canonical: [Bison's collection of solutions to common Git errors](<https://allluckly.cn/en/journal/2015-12-28-bison-s-collection-of-solutions-to-common-git-errors/>)
中文：[中文 HTML](<https://allluckly.cn/sdk/git01>)
English: [English HTML](<https://allluckly.cn/en/journal/2015-12-28-bison-s-collection-of-solutions-to-common-git-errors/>)
Published: 2015-12-28T00:00:00+08:00
Modified: 2026-10-23T10:34:11+08:00
Author: [Bison](<https://allluckly.cn/about/>)

Collects index-lock errors and warnings about Git's default push behaviour, with error screenshots and the configuration commands used at the time. It supports reviewing troubleshooting by error type; inspect the current repository state before applying a command.

Git troubleshooting notes collected by Bison.

English translation of the [Chinese original](<https://allluckly.cn/sdk/git01>), translated on 2026-10-23. The article body uses automated translation; app descriptions, historical reading notes and video subtitles receive separate editorial checks. Original publication dates, attribution, code and version notes are retained.

**Before you read** This technical note dates from 2015–2017. The examples have not been rerun as part of this archive update. Records Git issues on Windows 7 and the default push settings used at the time.

> "I have been using Windows 7 recently, and some tasks require `Git`. At first, I resisted."

I have been using Windows 7 recently, and some tasks require `Git`. I resisted at first, but had no choice but to give it a go. Here are some problems I encountered while using `Git` and how I solved them.

### -NO.1: Running ` git add  ` on a file produces the following error.

```css
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.
```

#### Solution: `rm -f ./.git/index.lock`

### -NO.2: Running ` git push  ` produces the following warning.

```css
warning: push.default is unset; its implicit value is changing in
Git 2.0 from 'matching' to 'simple'. To squelch this message
and maintain the current behavior after the default changes, use:

git config --global push.default matching

To squelch this message and adopt the new behavior now, use:

git config --global push.default simple
```

#### Solution: run `git config --global push.default matching`, then run git push again.

### -NO.3 A git commit produces the following error:

```css
fatal: Unable to create ‘project_path/.git/index.lock’: File exists. exists
```

#### Solution: `rm -f ./.git/index.lock`

These are all the issues I have encountered so far. I will update this whenever new ones arise.

Recommended reading: [Integrating a Baidu Mobile SSP launch ad in one minute](<https://allluckly.cn/en/journal/2015-12-26-integrating-a-baidu-mobile-ssp-launch-ad-in-one-minute/>)

Copyright © Bison. Please retain a hyperlink to the original article when reproducing it.