RuntimeError: Error evaluating function `lighten`: Argument cannot be evaluated to a color in /usr/src/app/app/style/colors.less on line 21, column 18:
20 @c-theme-tertiary: #939393;
21 @c-theme-accent: lighten(@c-theme-primary, 15%);
22 @c-theme-accent-light: lighten(@c-theme-accent, 20%);