[ERROR] Application Installer abnormal process termination. Process exit value was 8

I get this whenever I try to run an app in android emulator, I've tried reinstalling everything but to no avail - any suggestions would be very much appreciated

C:\Users\xxx\AppData\Roaming\npm\node_modules\titanium\node_modules\longjohn\dist\longjohn.js:185
        throw e;
              ^
TypeError: Bad argument
    at ChildProcess.spawn (child_process.js:946:24)
    at exports.spawn (child_process.js:746:9)
    at async.parallel.powershell (F:\Users\xxx\AppData\Roaming\Titanium\mobilesdk\win32\3.5.0.GA\node_modules\titanium-sdk\lib\windows.js:385:14)
    at F:\Users\xxx\AppData\Roaming\Titanium\mobilesdk\win32\3.5.0.GA\node_modules\async\lib\async.js:524:25
    at F:\Users\xxx\AppData\Roaming\Titanium\mobilesdk\win32\3.5.0.GA\node_modules\async\lib\async.js:111:13
    at Array.forEach (native)
    at _each (F:\Users\xxx\AppData\Roaming\Titanium\mobilesdk\win32\3.5.0.GA\node_modules\async\lib\async.js:32:24)
    at async.each (F:\Users\xxx\AppData\Roaming\Titanium\mobilesdk\win32\3.5.0.GA\node_modules\async\lib\async.js:110:9)
    at _parallel (F:\Users\xxx\AppData\Roaming\Titanium\mobilesdk\win32\3.5.0.GA\node_modules\async\lib\async.js:523:20)
    at async.parallel (F:\Users\xxx\AppData\Roaming\Titanium\mobilesdk\win32\3.5.0.GA\node_modules\async\lib\async.js:539:9)