Bootstrap 4 SASS compilation error in _root.scss?

Question

Sass

I connect to the project Bootstrap 4 SASS compilation error in _root.scss

Error: Invalid CSS after "...lor}: #{$value}": expected "{", was ";"

on line 4 of D:/OpenServer/domains/massa.loc/sass/_root.scss
from line 11 of D:/OpenServer/domains/massa.loc/sass/bootstrap.scss
from line 2 of D:/OpenServer/domains/massa.loc/sass/main.scss

1: :root {
2:   // Custom variable values only support SassScript inside `#{}`.
3:   @each $color, $value in $colors {
4:     --#{$color}: #{$value};
5:   }
6:
7:   @each $color, $value in $theme-colors {
8:     --#{$color}: #{$value};
9:   }"

joxi.ru/KAxpp3Lc4Y3wDA sass
version 3.5.3 Bleeding Edge
Didn't even help this
how to solve the problem?