Please enter valid username CSS rules.

Im having problem in adding fontawesome icon after the username of every user in a group.

Based on my understanding on Font awesome icons 2.3

code less should be like this
Code:

&:after{
    .m-faContent(@fa-var-icon-name);
}

but it always show error cant save.
Oops! We ran into some problems.
Please enter valid username CSS rules.

Читать далее...