'syntax error in visual studio code "expected [css-rcurlyexpected]"

I am getting [scss] } expected [css-rcurlyexpected] error in visual code for the commented line. Does anybody know why ?

@keyframes wordSlider {
  $steps: -0%, -25%, -50%, -75%;
  @for $index from 0 to length($steps)-1 {
    $next: $index + 1;
    $step: floor(100/ (length($steps)-1));
    $animation_step: floor($step * 0.2);
    //#{$step*$index}%,
    //#{($step*$next) - $animation_step}% {
    //   transform: translateY(nth($steps, $index + 1));
    //}
    100% {
      transform: translateY(nth($steps, length($steps)));
    }
  }
}


Solution 1:[1]

@keyframes wordSlider { 
    $steps: -0%, -25%, -50%, -75%; 
    @for $index from 0 to length($steps)-1 { 
        $next: $index + 1; 
        $step: floor(100/ (length($steps)-1)); 
        $animation_step: floor($step * 0.2); 
        //#{$step*$index}%, 
        //#{($step*$next) - $animation_step}% { 
        // transform: translateY(nth($steps, $index + 1));}// 

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Sources

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Source: Stack Overflow

Solution Source
Solution 1 UkFLSUI