Args parsing error

[oreqizer]

I don't know why this happens, however, a guy on SO assumed, it's the mixin's fault. Here are the details:
http://stackoverflow.com/questions/30051373/sass-breakpoint-mixin-args-error

EDIT:
Tried creating another clean project with breakpoint being the only dependency, it still fails if I simply try to @include breakpoint (500px) { };

EDIT 2:
The mixin:
@include susy-breakpoint(500px) { }
has exactly the same issue.

[Snugug]

Please provide a sassmeister.com showing the problem. I don't understand the issue being addressed