coffee-watcher error

gistfile1.txt

module.js:340
    throw err;
          ^
Error: Cannot find module 'commander'
    at Function.Module._resolveFilename (module.js:338:15)
    at Function.Module._load (module.js:280:25)
    at Module.require (module.js:362:17)
    at require (module.js:378:17)
    at Object.<anonymous> (/usr/local/lib/node_modules/coffee-watcher/lib/coffee-watcher.js:4:13)
    at Object.<anonymous> (/usr/local/lib/node_modules/coffee-watcher/lib/coffee-watcher.js:30:4)
    at Module._compile (module.js:449:26)
    at Object.Module._extensions..js (module.js:467:10)
    at Module.load (module.js:356:32)
    at Function.Module._load (module.js:312:12)