Found a nice little bug.
while develing i added an empty .less file as a place holder for some things to come.
But having a totally empty file makes the compiler throw very strange errors.
As soon as I put something in the file, it started working again.
What errors do you get?
What version of dotless are you using?
Is this a file importing an empty file or running the watcher and adding an empty file to the path?
I think this is a duplicate of #164 which is fixed.