Неверно определяется тэги в vuetify(vuejs)(vue-cli)

<v-card> 
        <v-card-title 
          class="headline grey lighten-2" 
          primary-title 
        > 
          About Course 
        </v-card-title> 
 
        <v-card-text> 
          iR Marketing is a full service consulting and marketing agency that specializes in brand marketing and sales campaigns for small and medium size businesses. 
        </v-card-text> 
 
        <v-divider></v-divider> 
 
        <v-card-actions> 
          <v-spacer></v-spacer> 
          <v-btn 
            color="primary" 
            flat 
            @click="dialog = false" 
          > 
            Close 
          </v-btn> 
        </v-card-actions> 
      </v-card>