[AC-1749] Can not build with simple download, build and run

[ERROR] :  TypeError: Arguments to path.join must be strings
    at path.js:360:15
    at Array.filter (native)
    at exports.join (path.js:358:36)
    at exports.detect (/Users/robrightmyer/Library/Application Support/Titanium/mobilesdk/osx/3.1.0.GA/node_modules/node-appc/lib/android.js:40:30)
    at /Users/robrightmyer/Library/Application Support/Titanium/mobilesdk/osx/3.1.0.GA/android/cli/commands/_build.js:28:11
    at /Users/robrightmyer/Library/Application Support/Titanium/mobilesdk/osx/3.1.0.GA/node_modules/titanium-sdk/lib/titanium.js:105:5
    at /Users/robrightmyer/Library/Application Support/Titanium/mobilesdk/osx/3.1.0.GA/node_modules/async/lib/async.js:454:21
    at /Users/robrightmyer/Library/Application Support/Titanium/mobilesdk/osx/3.1.0.GA/node_modules/async/lib/async.js:185:13
    at /Users/robrightmyer/Library/Application Support/Titanium/mobilesdk/osx/3.1.0.GA/node_modules/async/lib/async.js:86:13
    at Array.forEach (native)
---------------------------------------------
    at exports.execFile (child_process.js:656:9)
    at exports.exec (child_process.js:543:18)
    at detectLocale (/usr/local/lib/node_modules/titanium/lib/titanium.js:53:4)
    at setLocale (/usr/local/lib/node_modules/titanium/lib/titanium.js:60:3)
    at /usr/local/lib/node_modules/titanium/lib/titanium.js:83:3
    at Object.<anonymous> (/usr/local/lib/node_modules/titanium/lib/titanium.js:85:3)
    at Module._compile (module.js:456:26)
    at Module._extensions..js (module.js:474:10)
[ERROR] Unable to find command "build"