Local Testing is broken for me (npm start fails with cryptic error)

[exitmouse]

[Projects/static-fp @ faxl] npm start

> static-fp@1.0.0 start /home/jselover/Projects/static-fp
> parallelshell 'npm run watch' 'hugo server'

child_process.js:400
    throw new TypeError('"cwd" must be a string');
    ^

TypeError: "cwd" must be a string
    at normalizeSpawnArguments (child_process.js:400:11)
    at exports.spawn (child_process.js:487:38)
    at /home/jselover/Projects/static-fp/node_modules/parallelshell/index.js:104:17
    at Array.forEach (<anonymous>)
    at Object.<anonymous> (/home/jselover/Projects/static-fp/node_modules/parallelshell/index.js:100:6)
    at Module._compile (module.js:573:30)
    at Object.Module._extensions..js (module.js:584:10)
    at Module.load (module.js:507:32)
    at tryModuleLoad (module.js:470:12)
    at Function.Module._load (module.js:462:3)

My node version is 8.4.0