error de aplicación

app.js:sourcemap:1075 TypeError: Cannot read property 'get' of undefined
    at VueComponent.fetchData (app.js:sourcemap:42281)
    at VueComponent.boundFn [as fetchData] (app.js:sourcemap:692)
    at VueComponent.created (app.js:sourcemap:42311)
    at callHook (app.js:sourcemap:3174)
    at VueComponent.Vue._init (app.js:sourcemap:4735)
    at new VueComponent (app.js:sourcemap:4905)
    at createComponentInstanceForVnode (app.js:sourcemap:4187)
    at init (app.js:sourcemap:4004)
    at createComponent (app.js:sourcemap:5656)
    at createElm (app.js:sourcemap:5599)
handleError @ app.js:sourcemap:1075
callHook @ app.js:sourcemap:3176
Vue._init @ app.js:sourcemap:4735
VueComponent @ app.js:sourcemap:4905
createComponentInstanceForVnode @ app.js:sourcemap:4187
init @ app.js:sourcemap:4004
createComponent @ app.js:sourcemap:5656
createElm @ app.js:sourcemap:5599
createChildren @ app.js:sourcemap:5727
createElm @ app.js:sourcemap:5632
createChildren @ app.js:sourcemap:5727
createElm @ app.js:sourcemap:5632
createChildren @ app.js:sourcemap:5727
createElm @ app.js:sourcemap:5632
createChildren @ app.js:sourcemap:5727
createElm @ app.js:sourcemap:5632
patch @ app.js:sourcemap:6079
Vue._update @ app.js:sourcemap:2923
updateComponent @ app.js:sourcemap:3047
get @ app.js:sourcemap:3390
Watcher @ app.js:sourcemap:3379
mountComponent @ app.js:sourcemap:3051
Vue$3.$mount @ app.js:sourcemap:8372
Vue$3.$mount @ app.js:sourcemap:10575
init @ app.js:sourcemap:4010
createComponent @ app.js:sourcemap:5656
createElm @ app.js:sourcemap:5599
createChildren @ app.js:sourcemap:5727
createElm @ app.js:sourcemap:5632
createChildren @ app.js:sourcemap:5727
createElm @ app.js:sourcemap:5632
patch @ app.js:sourcemap:6115
Vue._update @ app.js:sourcemap:2923
updateComponent @ app.js:sourcemap:3047
get @ app.js:sourcemap:3390
Watcher @ app.js:sourcemap:3379
mountComponent @ app.js:sourcemap:3051
Vue$3.$mount @ app.js:sourcemap:8372
Vue$3.$mount @ app.js:sourcemap:10575
Vue._init @ app.js:sourcemap:4745
Vue$3 @ app.js:sourcemap:4830
(anonymous) @ app.js:sourcemap:10993
__webpack_require__ @ app.js:sourcemap:20
(anonymous) @ app.js:sourcemap:10967
__webpack_require__ @ app.js:sourcemap:20
(anonymous) @ app.js:sourcemap:63
(anonymous) @ app.js:sourcemap:66
app.js:8382 Download the Vue Devtools extension for a better development experience:
https://github.com/vuejs/vue-devtools
app.js:8392 You are running Vue in development mode.
Make sure to turn on production mode when deploying for production.
See more tips at https://vuejs.org/guide/deployment.html