Less-builder not detect children classes

[KasperKRK]

Hi. I've problem with compile less code to css. My code work properly in less.js.

This is stucture in part of my code: .box { border: 1px solid @box-border; padding:10px;

&.box-rounded {
    border-radius:5px;
}

&.box-white {
    background-color: #FFFFFF;
}

&.box-gray {
    background-color: #f9f9f9;
}

}

and after that i build other classes from this like for ex.

.box-classic { .bbox; .box-rounded; .box-white; }

This work fine in javascript compiler but not with less-builder. Now i don't know It's issue with my code or with builder.

It's error output from compiler NameError: .box-rounded is undefined in /home/mink/repo/redlight.loc/web/css/network/base.less:366:1 365 .bbox; 366 .box-rounded; 367 .box-white;

[Finished in 0.1s with exit code 2]