Why doesn't nesting selectors work in sass?

Question

Sass

Hello, why doesn't class nesting work?

Tried to do it differently.

Tried like this:

Nesting with parentheses as in the examples

.taskbar {
  	background-color: #101010
    
    li {
        width: 100px
    }
}

Выдает ошибку: messageOriginal: Invalid CSS after ".taskbar {": expected "}", was "{"

So:

Without brackets

.taskbar 
  	background-color: #101010
    li 
        width: 100px

Выдает ошибку: Illegal nesting: Only properties may be nested beneath properties.