What does this error means?

[khanharis87]

I am trying to test single file vue components, written in typescript. The test show the results and but PhantomJs log this error:

13 11 2017 12:41:44.146:INFO [PhantomJS 2.1.1 (Mac OS X 0.0.0)]: Connected on socket DEPPktsJlSAshGkrAAAA with id 24520037
PhantomJS 2.1.1 (Mac OS X 0.0.0) ERROR LOG: TypeError{stack: 'render@http://localhost:9876/base/index.ts?d60e9c5c3028f41abc44b16619415a72e026d7e7:54306:40
_render@http://localhost:9876/base/index.ts?d60e9c5c3028f41abc44b16619415a72e026d7e7:5717:26
updateComponent@http://localhost:9876/base/index.ts?d60e9c5c3028f41abc44b16619415a72e026d7e7:4017:28
get@http://localhost:9876/base/index.ts?d60e9c5c3028f41abc44b16619415a72e026d7e7:4360:29
Watcher@http://localhost:9876/base/index.ts?d60e9c5c3028f41abc44b16619415a72e026d7e7:4349:15
mountComponent@http://localhost:9876/base/index.ts?d60e9c5c3028f41abc44b16619415a72e026d7e7:4021:28
$mount@http://localhost:9876/base/index.ts?d60e9c5c3028f41abc44b16619415a72e026d7e7:9553:24
$mount@http://localhost:9876/base/index.ts?d60e9c5c3028f41abc44b16619415a72e026d7e7:11867:20
mount@http://localhost:9876/base/index.ts?d60e9c5c3028f41abc44b16619415a72e026d7e7:41339:14
shallow@http://localhost:9876/base/index.ts?d60e9c5c3028f41abc44b16619415a72e026d7e7:41359:15
http://localhost:9876/base/index.ts?d60e9c5c3028f41abc44b16619415a72e026d7e7:32825:43
create@http://localhost:9876/absolute/Users/haris/Documents/Repository/portal/node_modules/mocha/mocha.js?0863072fa0d42c0f56c2c43e36b6f2bd01402ae2:931:23
context@http://localhost:9876/absolute/Users/haris/Documents/Repository/portal/node_modules/mocha/mocha.js?0863072fa0d42c0f56c2c43e36b6f2bd01402ae2:744:33
http://localhost:9876/base/index.ts?d60e9c5c3028f41abc44b16619415a72e026d7e7:32824:9
__webpack_require__@http://localhost:9876/base/index.ts?d60e9c5c3028f41abc44b16619415a72e026d7e7:20:34
webpackContext@http://localhost:9876/base/index.ts?d60e9c5c3028f41abc44b16619415a72e026d7e7:32797:28
forEach@[native code]
http://localhost:9876/base/index.ts?d60e9c5c3028f41abc44b16619415a72e026d7e7:31418:28
__webpack_require__@http://localhost:9876/base/index.ts?d60e9c5c3028f41abc44b16619415a72e026d7e7:20:34
http://localhost:9876/base/index.ts?d60e9c5c3028f41abc44b16619415a72e026d7e7:63:37
global code@http://localhost:9876/base/index.ts?d60e9c5c3028f41abc44b16619415a72e026d7e7:64:12', line: 54306, sourceURL: 'http://localhost:9876/base/index.ts?d60e9c5c3028f41abc44b16619415a72e026d7e7'}