ERRNO::ENOENT: No such file or directory @rb_sysopen - sass/app.sass

Question

So I am using Atom, but when I use my Atom live-server, the css styles do not apply, in fact I get an error

ERRNO::ENOENT: No such file or directory @rb_sysopen - sass/app.sass 

Should I not be using Atom live-server?

This is the command I am using in the terminal:

sass --watch sass:css

This is my file structure:

Answer 1

You should be located in the SassStructure folder. Like this:

../SassStructure $ sass --watch sass:css

sass:css is a reference to both folders: sass, and css.