.no-select() {
  -webkit-touch-callout: none;
  -webkit-user-select: none;
  -khtml-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
}

.tutor-background-image(@img) { background-image:url("../resources/images/@{img}"); }

.no-select() {
  -webkit-touch-callout: none;
  -webkit-user-select: none;
  -khtml-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
}

.tutor-background-image(@img) { background-image:url("@{img}"); }

Correct path for tutor-background-image mixin
Correct path for tutor-background-image mixin
