Change dashboardPlugin location,

resources/assets/js/views/portal/dashboard.js

@@ -9,12 +9,17 @@ require('./../../bootstrap');
 
 import Vue from 'vue';
 
+import DashboardPlugin from './../../plugins/dashboard-plugin';
+
 import Global from './../../mixins/global';
 
 import {Tooltip} from 'element-ui';
 
 Vue.use(Tooltip);
 
+// plugin setup
+Vue.use(DashboardPlugin);
+
 const app = new Vue({
     el: '#app',