When I activate the Vuex store as it is shown on the official website I get an error that the index.js file within the store folder should export a method which returns a Vuex instance.
<img width="940" alt="bildschirmfoto 2017-05-25 um 20 04 00" src="https://cloud.githubusercontent.com/assets/23220690/26463892/1c99428e-4186-11e7-975e-2c337ec1e67d.png">
<img width="800" alt="bildschirmfoto 2017-05-25 um 20 04 41" src="https://cloud.githubusercontent.com/assets/23220690/26463895/1eabf698-4186-11e7-93cd-e4da27c59d21.png">
<img width="838" alt="bildschirmfoto 2017-05-25 um 20 05 25" src="https://cloud.githubusercontent.com/assets/23220690/26463901/224d4ef0-4186-11e7-8bf8-187c58ab775f.png">
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