here i want to player can open a gui only by clicking on the mob with same name but the gui only open for host  player. What i did wrong?

public ActionResultType func_230254_b_(PlayerEntity playerEntity, Hand hand) {
    if (!this.world.isRemote) {
       String en = this.getCustomName().getString();
       String pl = playerEntity.getScoreboardName();

     if(en.equals(pl))
     {
         MobScreen.open();
     }
     else
         playerEntity.sendMessage(new TranslationTextComponent("You are not  "+en),Util.DUMMY_UUID);

    }

    return ActionResultType.func_233537_a_(this.world.isRemote);
}

public static void open() {
    Minecraft.getInstance().displayGuiScreen(new MobScreen());
}

Thanks its working now