Why is Sass throwing an error?

Question

css

Installed Sass, everything seems to be fine. But I can't run. It gives the following error (on top in the browser):
vk.com/jack_king?z=photo214984230_353198302%2Falbu...

Answer 1

No error no answer))) Joke. If you are a beginner then you can use interface compilers.
Here is the list
I use gulp myself.

Answer 2

Can I connect a certificate from letsencrypt to this subdomain?

You can, there are no requirements. You will only need to correctly configure this subdomain on the web server - specify the correct certificate file.