Error building new Alloy project to device: needquote = ("" in arg) or ("\t" in arg) or not arg

Hi, I'm new to Titanium and I'm trying to build a new Alloy project to my android device. But I'm getting this error:

[ERROR] Exception occured while building Android project:
[ERROR] Traceback (most recent call last):
[ERROR]   File "/Users/mbaaij/Library/Application Support/Titanium/mobilesdk/osx/3.1.4.v20140122162104/android/builder.py", line 2620, in <module>
[ERROR]     builder.build_and_run(True, avd_id, device_args=device_args, debugger_host=debugger_host, profiler_host=profiler_host)
[ERROR]   File "/Users/mbaaij/Library/Application Support/Titanium/mobilesdk/osx/3.1.4.v20140122162104/android/builder.py", line 2399, in build_and_run
[ERROR]     launched, launch_failed = self.package_and_deploy()
[ERROR]   File "/Users/mbaaij/Library/Application Support/Titanium/mobilesdk/osx/3.1.4.v20140122162104/android/builder.py", line 1893, in package_and_deploy
[ERROR]     output = run.run([zipalign, '-v', str(ALIGN_32_BIT), app_apk, app_apk+'z'])
[ERROR]   File "/Users/mbaaij/Library/Application Support/Titanium/mobilesdk/osx/3.1.4.v20140122162104/android/run.py", line 38, in run
[ERROR]     print "[DEBUG] %s" % subprocess.list2cmdline(args_to_log)
[ERROR]   File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/subprocess.py", line 618, in list2cmdline
[ERROR]     needquote = (" " in arg) or ("\t" in arg) or not arg
[ERROR] TypeError: argument of type 'NoneType' is not iterable