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I am unable to fix the warning:

Could not find one or more icon(s) {prefix: "far", iconName: "square"} {}" (screenshot attached) The warning pops when I change the value of the 'typeOfAreaClass' or select 'safe area' from the "areaClass"

Here is the screenshot of the menu of v-select with the 'square ' icon:

I tried installing the font awesome library. It didn't help. One thing I figured out is that the warning occurs when I add the prop "multiple" to the v-select component. If I remove that prop, there is no warning. But it kills the purpose. Does this this help you give a suggestion? My font awesome ions are working fine. Only the v-select prop 'multiple' is creating the warning.

Here is the HTML code

  <v-flex xs12 md4 sm4  >
    <v-select
    class="myfont1 mt-3 pa-0 customDecoration text-xs-right" 
    @change="assignHazGroups"
    :items="typeOfAreaClassItems"
    v-model="typeOfAreaClassSelect"
    style="max-width:170px;"
    dense
    ></v-select> 
  </v-flex>

  <v-flex xs12 md4 sm4  >
    <v-select
    class="myfont1 mt-3 pa-0 mx-0 customDecoration" 
    @change="safeAreaFilter"
    :items="typeOfAreaClassSelect ==='American' ?areaClassAmericanItems:areaClassEuropeanItems"
    v-model="areaClassSelect"
    style="max-width:220px;"
    dense
    ></v-select> 
  </v-flex>

  <v-flex xs12 md4 sm4 class="ma-0 pa-0"
  >
    <v-select
    class="myfont1 mt-3 pa-0 mx-0 customDecoration"
    :items="typeOfAreaClassSelect =='American' ?hazGroupAmericanItems:hazGroupEuropeanItems"
    v-model="hazGroupSelect"
    multiple
    small-chips
    style="max-width:350px;"
    dense
    ></v-select>    

  </v-flex>

Here are the array variables

typeOfAreaClassItems:["American","European"],
            areaClassAmericanItems:[
                "Safe Area",
                "Class I, Div 1/Class I, Div 2",
                "Class I, Div 1",
                "Class I, Div 2",
            ],
            areaClassEuropeanItems:[
                "Safe Area",
                "Zone-1/Zone-2",
                "Zone-1",
                "Zone-2"
            ],
            hazGroupAmericanItems:[
                "Group A",
                "Group B",
                "Group C",
                "Group D",
                "NA"
            ],
            hazGroupEuropeanItems:[
                "IIC",
                "IIB+H2",
                "IIB",
                "IIA",
                "NA"
            ],
            eleCertItems:[
                "CSA",
                "UL",
                "ATEX",
                "FM",
                "PESO",
                "JIS (Japan)",
                "GOST (Russia)"
            ],
            
            
  //computed variables          
            typeOfAreaClassSelect:{
                get () {
                    return this.$store.getters.typeOfAreaClassSelect
                },
                set (value) {
                    this.$store.dispatch('setTypeOfAreaClassSelect',{data:value})
                }
            },
            areaClassSelect:{
                get () {
                    return this.$store.getters.areaClassSelect
                },
                set (value) {
                    this.$store.dispatch('setAreaClassSelect',{data:value})
                }
            },
            hazGroupSelect:{
                get () {
                    return this.$store.getters.hazGroupSelect
                },
                set (value) {
                    this.$store.dispatch('setHazGroupSelect',{data:value})
                }
            },
            eleCertSelect:{
                get () {
                    return this.$store.getters.eleCertSelect
                },
                set (value) {
                    this.$store.dispatch('setEleCertSelect',{data:value})
                }
            },
            
            

And here are the functions

assignHazGroups(){
    if(this.typeOfAreaClassSelect === "American"){
        this.areaClassSelect = "Class I, Div 2"
        this.hazGroupSelect = [
            "Group A",
            "Group B"
        ]
    }
    else{
        this.areaClassSelect = "Zone-2"
        this.hazGroupSelect = [
            "IIB",
            "IIA"
        ]
    }
},
safeAreaFilter(){
    if(this.areaClassSelect === "Safe Area"){
        this.hazGroupSelect = ["NA"]
    }
    else{
        if(this.typeOfAreaClassSelect === "American"){
            this.hazGroupSelect = [
                "Group A",
                "Group B"
            ]
        }
        else{
            this.hazGroupSelect = [
                "IIB",
                "IIA"
            ]
        }
    }
},

It appears when I invoke the @change event and call a function. Need to get rid of this warning. The code is all running fine.

Answers

The problem

Vuetify's v-simple-checkbox component uses the icon checkboxOff according to the documentation.

The error that is raised is saying that the icon far fa-square cannot be found in Font Awesome. That is because in version 5 the icon is fas fa-square from the documentation.

Font Awesomes' FaSvg library assumes that all of the icons are prepended with fas which is why the icon far fa-square cannot be found.

The solution

The fix is to overwrite the checkboxOff icon with the correct value.

setup/vuetify.js

// All of the import and setup
import Vue from 'vue';
import Vuetify from 'vuetify/lib';

import {library} from "@fortawesome/fontawesome-svg-core";
import {FontAwesomeIcon} from "@fortawesome/vue-fontawesome";
import {fas} from "@fortawesome/free-solid-svg-icons"

Vue.component('font-awesome-icon', FontAwesomeIcon)
library.add(fas)

Vue.use(Vuetify);

// The configuration
export default new Vuetify({
  icons: {
    iconfont: "faSvg",
    values: {
      // The important part!!
      checkboxOff: {
        component: FontAwesomeIcon,
        props: {
          icon: ['fa', 'square'],
        }
      }
    }
  },
});

main.js

import App from './App.vue';
import vuetify from './setup/vuetify';

export default new Vue({
  vuetify,
  render: h => h(App),
}).$mount('#app')