Sorry for novice question. I am taking the first baby steps to learn Less and Sass. Here is my less syle in the file
style.less
@basecolor:#53353;
header {
font-family: cursive,sans-serif;
background-color: lighten(@basecolor, 50%);
border: 5px solid darken(@basecolor, 50%);
color:@basecolor;
padding: 40px;
}
RuntimeError: error evaluating function `lighten`: a.toHSL is not a function