Vee-validate and vuetify checkbox group with v-for

I have some problem with vee-validate, vuetify and v-for. There is my code :

<ValidationProvider
  name="availableLanguages"
  rules="required"
  v-slot="{ errors }"
>
  <v-row>
    <v-col
      cols="2"
      v-for="availableLanguage in availableLanguages"
      :key="availableLanguage.label"
    >
      <v-checkbox
        v-model="selectedLanguage"
        :label="availableLanguage.label"
        :value="availableLanguage.value"
        :error="errors.length > 0"
        hide-details
        @click="setDefaultLanguage"
        key="availableLanguage-input"
      />
    </v-col>
  </v-row>
  <v-row>
    <v-col
      cols="12"
      class="errorCheckBox"
    >
      {{ errors[0] }}
    </v-col>
  </v-row>
</ValidationProvider>

What is the expected result ?

I have a checkbox group. I want if all checkboxes are unchecked then an error message appear.

What's happened ?

If i don't click once on the first iteration of the v-for loop, the error is not trigger.

Thanks for help.