I am new to Emacs and Slime. I have been using both of them daily for the last 10 days. And it is amazing! I am impressed.

Today, I decided to install and try the package Paredit. Not sure if this is a coincidence, but after a while, Slime stopped working as it used to.

I was using C-c C-c all the time to compile specific Common Lisp functions. Now, it does not work.

Even with slime running after pressing M-x slime I get from the mini-buffer:

C-c C-c is undefined

If I try a stronger compilation with C-c C-k the keyboard also does not work.

However, the compilation works if I manually compile the region or the whole file after typing on the mini-buffer:

M-x slime-compile-region

M-x slime-compile-and-load

Before writing this, even the manual typed compilation was not working. Suddenly, it started to work again. But the keyboard shortcut is not back.

I do not really understand this behavior from emacs/slime.

This is my current config file.

Why is this happening? Did I break something after installing Paredit?

What should I inspect to understand why the famous commands (C-c C-c and C-c C-k) suddenly stopped working?

Thanks for your attention.

  • 1
    If the Sly/Slime conflict from your other question resolves this be sure to come back and self answer.
    – nega
    Commented May 26, 2021 at 22:00
  • @nega, sure. I would be really glad to do it! Commented May 26, 2021 at 22:02

1 Answer 1


I did not mention it in my post, but after installing Paredit I also installed Sly, a fork from the Slime project. This was the root of the problem.

I learned how to uninstall packages with this post.

In addition, @nega connected the dots between this problem and this other post.

After removing Sly, Slime is perfectly functioning! And the keybindings such as C-c C-c are working as usual.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.