prerender throws TypeError: path must be a string or Buffer

[cubodehelio]

Actually the babel stage works fine but the resulting lib/render.js fails.

fs.js:640
  return binding.open(pathModule._makeLong(path), stringToFlags(flags), mode);
                 ^

TypeError: path must be a string or Buffer
    at TypeError (native)
    at Object.fs.openSync (fs.js:640:18)
    at Object.fs.writeFileSync (fs.js:1333:33)
    at Object.<anonymous> (/***/docbox/dist/render.js:46:14)
    at Module._compile (module.js:570:32)
    at Object.Module._extensions..js (module.js:579:10)
    at Module.load (module.js:487:32)
    at tryModuleLoad (module.js:446:12)
    at Function.Module._load (module.js:438:3)
    at Module.runMain (module.js:604:10)

[cubodehelio]

nevermind, I think I was using it wrong