$ node -v
    v0.10.17
    
    $ yo -v
    1.0.0
    
    # this works:
    $ yo webapp
    ...
    
    # this doesn't:
    $ yo
    ...
    fs.js:427
      return binding.open(pathModule._makeLong(path), stringToFlags(flags), mode);
                    ^
    TypeError: path must be a string
        at Object.fs.openSync (fs.js:427:18)
        at Object.fs.readFileSync (fs.js:284:15)
        at yoyo.Base.rootGeneratorName (/usr/local/lib/node_modules/yo/node_modules/yeoman-generator/lib/base.js:533:24)
        at yoyo.Base._setStorage (/usr/local/lib/node_modules/yo/node_modules/yeoman-generator/lib/base.js:542:34)
        at yoyo.Base (/usr/local/lib/node_modules/yo/node_modules/yeoman-generator/lib/base.js:85:8)
        at new yoyo (/usr/local/lib/node_modules/yo/bin/yoyo.js:12:18)
        at Environment.create (/usr/local/lib/node_modules/yo/node_modules/yeoman-generator/lib/env.js:366:10)
        at Environment.run (/usr/local/lib/node_modules/yo/node_modules/yeoman-generator/lib/env.js:409:24)
        at init (/usr/local/lib/node_modules/yo/bin/yo:97:7)
        at pre (/usr/local/lib/node_modules/yo/bin/yo:109:3)