15  Troubleshooting Common Problems

Learning Objectives

  • Recognize several common problems when using GitHub

  • Learn how to troubleshoot common Git issues with step-by-step solutions

  • Build confidence navigating authentication, syncing, and collaboration challenges

What Are Common GitHub Problems?

Even experienced users encounter problems when working with Git and GitHub. These issues usually occur during setup, collaboration, or when switching between tools like RStudio, VSCode, and Git GUI.

When Do These Problems Occur?

  • Pushing changes without proper authentication

  • Pulling updates when your local files have diverged

  • Conflicting file versions due to multiple contributors

  • Forgetting to stage, commit, or sync your changes

  • Not configuring Git properly the first time

Step-by-Step Guide to Fix Common Issues

Problem 1: Authentication Failed

What it looks like: You’re prompted for a password, but login fails.
Why it happens: GitHub no longer supports password authentication for HTTPS.

Solution:

  1. Generate a Personal Access Token (PAT).

  2. Use the token in place of your GitHub password when prompted.

  3. Consider using an SSH key for future sessions (especially in VSCode).

Problem 2: Repo Exists on GitHub, But Push Fails

What it looks like: You get an error saying remote repository not found or push is rejected.
Why it happens: The GitHub repo is initialized with a README or other files that conflict with your local setup.

Solution:

  1. When creating the repo on GitHub, do not initialize with README, license, or .gitignore.

  2. If conflicts exist, pull first:

    git pull origin main --allow-unrelated-histories

  3. Resolve any conflicts, then push.

Problem 3: Git Not Detected

What it looks like: Git features are missing in RStudio or VSCode.
Why it happens: Git is not installed or not properly linked to your IDE.

Solution:

  1. Install Git from git-scm.com.

  2. Restart your IDE.

  3. In RStudio: Go to Tools > Global Options > Git/SVN and verify the Git executable path.

  4. In VSCode: Git should be detected automatically. If not, check your system path.

Problem 4: Changes Aren’t Showing on GitHub

What it looks like: You committed locally, but nothing appears in your GitHub repo.
Why it happens: You forgot to push your changes.

Solution:

  1. After committing, push using:

    git push origin main

  2. Refresh the GitHub page to confirm.

Problem 5: You Cloned the Wrong Repo or Fork

What it looks like: You’re editing a repo, but you can’t push changes.
Why it happens: You cloned the original repo instead of your fork.

Solution:

  1. Fork the original repository on GitHub.

  2. Clone your fork, not the original project.

  3. Confirm your remote URL with:

    git remote -v

Tool-Specific Tips

RStudio

  • Use the Git tab to commit and push

  • If Git tab is missing, configure Git in Tools > Global Options > Git/SVN

VSCode

  • Use the Source Control tab

  • Look for inline errors or tooltips when actions fail

Git GUI

  • Use “Rescan” and “Push” manually

  • Add remote via Remote > Add

Summary

Problem Fix
Authentication fails Use PAT or set up SSH
Push fails due to README conflict Don’t initialize GitHub repo with README
Git not recognized Install Git and restart IDE
Can’t push changes Make sure you’re on the correct branch and have committed
Wrong repo cloned Confirm remote URL matches your GitHub fork

Additional Resources