In case you run into issues here are a few tips that can help you diagnose the problem.

Generally, it's not a bad idea to configure Emacs to spit the backtrace on error (instead of just logging the error in the `*Messages*` buffer). You can toggle this behavior by using `M-x` `toggle-debug-on-error`.

## Debugging Projectile commands

Emacs features a super powerful built-in Emacs Lisp debugger and using it is the best way to diagnose problems of any kind.

Tip

Here's a great crash course on using the debugger.

To debug some command you need to do the following:

- Figure out the name of the command you want to debug (e.g. by using `C-h k` to see which command is associated with some keybinding)
- Find the source of the command (e.g. by using `M-x` `find-function` `RET` `function-name`)
- Press `C-u C-M-x` while in the body of the function
- Run the command again

At this point you'll be dropped in the debugger and you can step forward until you find the problem.

## Profiling Projectile commands

Emacs comes with a built-in profiler. Using it is pretty simple:

1. Start it with `M-x` `profiler-start`.
2. Invoke some commands.
3. Get the report with `M-x` `profiler-report`.

Tip

If you intend to share the profiling results with someone it's a good idea to save the report buffer to a file with `C-x C-w`.

## Commonly encountered problems (and how to solve them)

Sometimes a Projectile command might hang for a while (e.g. due to a bug or a configuration issue). Such problems are super annoying, but are relatively easy to debug. Here are a few steps you can take in such situations:

- Do `M-x` `toggle-debug-on-quit`
- Reproduce the problem
- Hit `C-g` around 10 seconds into the hang

This will bring up a backtrace with the entire function stack, including function arguments. So you should be able to figure out what's going on (or at least what's being required).

### I upgraded Projectile using `package.el` and nothing changed

Emacs doesn't load the new files, it only installs them on disk. To see the effect of changes you have to restart Emacs.

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