This error is related to permission issues with the .git directory. Check the permissions for your Git folder or run Git commands with elevated privileges.

The 'cannot open .git/FETCH_HEAD: Permission denied' error usually signals restricted permissions on the .git directory, which Git needs access to for operations like fetch or pull.

Start by checking permissions using ls -la .git to ensure your user account has 'read' and 'write' permissions.

If not, adjust them with chmod -R 755 .git.

For Windows, right-click the .git folder, go to Properties > Security, and make sure your user has full access.

If permissions look correct but errors persist, try running Git commands as an administrator (sudo git fetch on Unix, or 'Run as Administrator' on Windows).

Resolving these permission issues typically allows Git to execute commands without obstruction.