Error compiling

[bagaweb]

This is the error appearing in problems after saving the .less file:

Error evaluating functionunit: the first argument to unit must be a number. Have you forgotten parenthesis?

This is the less code giving the error on the last line:

.loop(@index) when(@index =< 12) {
  .nav-open li:nth-child(@{index}) {
    transition-delay: unit(@index / 10, s);
  }
  .loop(@index + 1);
}
.loop(0);

[mrcrowl]

I would recommend adding parentheses around @index / 10. I believe that is causing the issue you're seeing.

This can be further controlled via the "math" setting.

[bagaweb]

Thank you very much, that did the trick!