5:38:03] TypeError: Cannot read property 'mtime' of undefined
    at c:\git\pos\node_modules\karma\lib\file-list.js:173:37
    at Array.map (native)
    at c:\git\pos\node_modules\karma\lib\file-list.js:167:30
    at Array.map (native)
    at List._refresh (c:\git\pos\node_modules\karma\lib\file-list.js:150:37)
    at List.refresh (c:\git\pos\node_modules\karma\lib\file-list.js:249:27)
    at Server._start (c:\git\pos\node_modules\karma\lib\server.js:149:12)
    at invoke (c:\git\pos\node_modules\karma\node_modules\di\lib\injector.js:75:15)
    at Server.start (c:\git\pos\node_modules\karma\lib\server.js:91:18)
    at runTests (c:\git\pos\gulpfile.js:684:11)
    at c:\git\pos\gulpfile.js:714:6
    at bound (domain.js:254:14)
    at runBound (domain.js:267:12)
    at asyncRunner (c:\git\pos\node_modules\gulp\node_modules\undertaker\node_modules\bach\node_modules\async-done\index.js:38:18)
    at process._tickCallback (node.js:355:11)
    at Function.Module.runMain (module.js:503:11)