Sub-Theme Question

I am trying to compile a style sheet using the instructions given at this link:

I seem to be getting the errors such as:

C:\htdocs\drupal738\sites\all\themes\bootstrap_subtheme\less>C:\htdocs\node-64bi
t.exe lessc C:\htdocs\drupal738\sites\all\themes\bootstrap_subtheme\less\style.l
ess  1>C:\htdocs\drupal738\sites\all\themes\bootstrap_subtheme\css\style.css
module.js:338
    throw err;
          ^
Error: Cannot find module 'C:\htdocs\drupal738\sites\all\themes\bootstrap_subthe
me\less\lessc'
    at Function.Module._resolveFilename (module.js:336:15)
    at Function.Module._load (module.js:278:25)
    at Function.Module.runMain (module.js:501:10)
    at startup (node.js:129:16)
    at node.js:814:3

Any ideas what these errors could be? Alternatively, could somebody tell me what the final style sheet should look like so that I can copy and paste it in the current style sheet that is completely blank.

Thank you.