karme-spec-error

$ karma start test/karma.config.js
INFO [karma]: Karma v0.11.0 server started at http://localhost:9876/
INFO [launcher]: Starting browser PhantomJS
INFO [PhantomJS 1.9.2 (Windows 7)]: Connected on socket YY0_26O3b-JFYhFhcBCA
ERROR [karma]: [TypeError: Cannot call method 'push' of undefined]
TypeError: Cannot call method 'push' of undefined
    at onBrowserStart (d:\Projects\WaveMaker\forked\WaveMaker\wavemaker-studio\wavemaker-core\src\main\webapp\node_modul
es\karma\lib\reporters\Base.js:14:20)
    at EventEmitter.emit (events.js:98:17)
    at onStart (d:\Projects\WaveMaker\forked\WaveMaker\wavemaker-studio\wavemaker-core\src\main\webapp\node_modules\karm
a\lib\browser.js:99:13)
    at Socket.EventEmitter.emit [as $emit] (events.js:95:17)
    at SocketNamespace.handlePacket (d:\Projects\WaveMaker\forked\WaveMaker\wavemaker-studio\wavemaker-core\src\main\web
app\node_modules\karma\node_modules\socket.io\lib\namespace.js:335:22)
    at Manager.onClientMessage (d:\Projects\WaveMaker\forked\WaveMaker\wavemaker-studio\wavemaker-core\src\main\webapp\n
ode_modules\karma\node_modules\socket.io\lib\manager.js:488:38)
    at WebSocket.Transport.onMessage (d:\Projects\WaveMaker\forked\WaveMaker\wavemaker-studio\wavemaker-core\src\main\we
bapp\node_modules\karma\node_modules\socket.io\lib\transport.js:387:20)
    at Parser.<anonymous> (d:\Projects\WaveMaker\forked\WaveMaker\wavemaker-studio\wavemaker-core\src\main\webapp\node_m
odules\karma\node_modules\socket.io\lib\transports\websocket\default.js:36:10)
    at Parser.EventEmitter.emit (events.js:95:17)
    at Parser.parse (d:\Projects\WaveMaker\forked\WaveMaker\wavemaker-studio\wavemaker-core\src\main\webapp\node_modules
\karma\node_modules\socket.io\lib\transports\websocket\default.js:343:12)
    at Parser.add (d:\Projects\WaveMaker\forked\WaveMaker\wavemaker-studio\wavemaker-core\src\main\webapp\node_modules\k
arma\node_modules\socket.io\lib\transports\websocket\default.js:315:8)
    at Socket.<anonymous> (d:\Projects\WaveMaker\forked\WaveMaker\wavemaker-studio\wavemaker-core\src\main\webapp\node_m
odules\karma\node_modules\socket.io\lib\transports\websocket\default.js:169:17)
    at Socket.EventEmitter.emit (events.js:117:20)
    at Socket.<anonymous> (_stream_readable.js:746:14)
    at Socket.EventEmitter.emit (events.js:92:17)
    at emitReadable_ (_stream_readable.js:408:10)
    at emitReadable (_stream_readable.js:404:5)
    at readableAddChunk (_stream_readable.js:165:9)
    at Socket.Readable.push (_stream_readable.js:127:10)
    at TCP.onread (net.js:526:21)