dotless has stopped working

[gin93r]

I've installed LESS-build. tried to compile and dotless (1.3.1.0) stops working. The output from the build is:

Unhandled Exception: System.ArgumentException: The path is not of a legal form.
   at System.IO.Path.NormalizePathFast(String path, Boolean fullCheck)
   at System.IO.Path.GetDirectoryName(String path)
   at dotless.Compiler.Program.Main(String[] args)
[Finished in 38.7s with exit code -532459699

Any ideas how to get this to build? If it helps, I'm using bootstrap 3's less files. I've changed the selector from source.css.less to source.less

My folder structure is: www -- css -- less

[gin93r]

I decided to try a restart and dotless now works... however I'm getting a compile error.

[Compile]
C:\Users\cmorlock.DNPB\AppData\Roaming\Sublime Text 2\Packages\LESS-build\LESS-normal.sublime-build-choice -> C:\Users\cmorlock.DNPB\AppData\Roaming\Sublime Text 2\Packages\LESS-build\LESS-normal.css

Content after finishing parsing (missing opening bracket?) on line 1 in file 'C:\Users\cmorlock.DNPB\AppData\Roaming\Sublime Text 2\Packages\LESS-build\LESS-normal.sublime-build-choice':
   []: /beginning of file
  [1]: {
       ^
  [2]:     "cmd": ["lessc", "$file", "${file_path}/${file_base_name}.css", "--verbose"],
[Done - Failed]
[Finished in 0.3s with exit code -5]