Less file > menu.less does not compile

[inglkruiz]

Line 47, 48 and 49. That way of invoking a mixin is rare, I think is not correct. After erase those lines menu.less compiles fine.

#ui-grid-twbs > .btn();
#ui-grid-twbs > .button-size(1px; 1px; 10px; 1; 2px);
#ui-grid-twbs > .button-variant(transparent, transparent, transparent);