1๐
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I believe, you have to initalize those variables.
new Vue({
el: '#app',
data: {
display_version:"",
buildNumber: ""
}
})
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.17/vue.js"></script>
<div id="app">
<div style="margin-top:50px" class="text-right">
Version: <b>{{display_version}}</b> - Release:<b>{{buildNumber}}</b>
</div>
</div>
Source:stackexchange.com