Checklists for software errors, setup, and tool workflows.

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Latest checklists

You run git pull or git merge and get:

fatal: refusing to...

Fix Git 'index.lock' File Exists Error in SourceTree
If you use SourceTree and see an error message like fatal: Unable to create 'path/to/.g...

Fix 'git remote origin already exists' Error on Mac
If you see fatal: remote origin already exists when trying to add a remote repositor...

Fix 'pip install externally managed environment' Error
If you're seeing pip install fail with a message about an externally managed env...

Python Requests Timeout Exception Handling: Practical Fixes
When using the Python requests library, a timeout exception occurs when a server tak...

How to Update Git Remote Origin URL
When a repository's remote URL changes—for example, after migrating to a new Git server or sw...