scss for $val from 1 to var--num SassError 90var--num is not a number

This error is occurring because the variable "--num" is not being recognized as a number by the Sass compiler.

To fix this, you need to ensure that the variable "--num" is defined with a numeric value.

For example, you could define it like this:

:root { --num: 10; }

Then, your SCSS code would work as expected:

@for $val from 1 to var(--num) { // loop code here }