Autocompletion with [TAB][TAB] on command's arguments, throws exception

[tytodorov]

$ tns platform add [TAB][TAB]
- - - - -
at CommandDispatcher.completeCommand (c:\Users\tytodorov\AppData\Roaming\npm\node_modules\nativescript\lib\common\dispatchers.js:38:59)
at FiberFuture.Future.wait (c:\Users\tytodorov\AppData\Roaming\npm\node_modules\nativescript\node_modules\fibers\future.js:415:10)
at FiberFuture.Future.wait (c:\Users\tytodorov\AppData\Roaming\npm\node_modules\nativescript\node_modules\fibers\future.js:416:15)
at Function.settle (c:\Users\tytodorov\AppData\Roaming\npm\node_modules\nativescript\node_modules\fibers\future.js:148:26)
at Object.complete (c:\Users\tytodorov\AppData\Roaming\npm\node_modules\nativescript\node_modules\tabtab\lib\completion.js:68:3)
at c:\Users\tytodorov\AppData\Roaming\npm\node_modules\nativescript\lib\common\dispatchers.js:92:35
at c:\Users\tytodorov\AppData\Roaming\npm\node_modules\nativescript\lib\common\services\commands-service.js:136:20
at completeCallback (c:\Users\tytodorov\AppData\Roaming\npm\node_modules\nativescript\lib\common\services\commands-service.js:108:34)
TypeError: undefined is not a function