Help :| - Inventory

I'm new in Writting plugins
I have this code:

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Code:

    public Inventory inv;
    @Override
    public boolean onCommand(CommandSender player, Command cmd, String label, String[] args) {
        if(cmd.getName().equalsIgnoreCase("vip")){
            player.sendMessage("Otwieram testowe inventory ;)");
           inv = Bukkit.createInventory(null, 9, "Funny Menu");
           inv.setItem(0, new ItemStack(Material.DIAMOND));
            sender.openInventory(inv);
            return true;
        }
     
 
        return false;
    }

"sender cannot be resolved" [line 29: sender.openInventory(inv);]
What should i do ?

and sorry for my English if i did some mistakes

 

@BitaSmietana The variable "sender" doesn't exist.

 

@bwfcwalshy
Ok, sorry
now
"Method openInventory(inventory) is undefined for the type CommandSender"
same line
Code:

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Code:

    public Inventory inv;
    @Override
    public boolean onCommand(CommandSender sender, Command cmd, String label, String[] args) {
        if(cmd.getName().equalsIgnoreCase("vip")){
            sender.sendMessage("Test Inventory opened ;)");
           inv = Bukkit.createInventory(null, 9, "Funny Menu");
           inv.setItem(0, new ItemStack(Material.DIAMOND));
            sender.openInventory(inv);
            return true;
        }
      
  
        return false;
    }

 

@BitaSmietana
Like @bwfcwalshy has said, the variable does not exist, however you should also consider checking the sender has an instance of a Player, otherwise the command will also be executable from console.

@BitaSmietana

You must cast your sender variable as a player

Code:

Player player = (Player) sender;

 

@Kassestral
So how i can create this variable, sorry this is my second plugin (if i can name it plugin ^^)

@edit
Ok thanks

 

@BitaSmietana In the method arguments change the "CommandSender player" to "CommandSender sender" then check if sender is an instance of a Player and do the cast.