[Vince]

Your braces don't match up. The opening brace I marked in ORANGE has a closing brace I marked in RED and the last lines are below that closing brace and thus outside the callback and thus invalid.

Код:

forward OnPlayerModelSelection(playerid, response, listid, modelid);
public OnPlayerModelSelection(playerid, response, listid, modelid){
{
	if(listid == DUTYSKINS)
	{
	    if(response)
	    {
    		SetPlayerSkin(playerid, modelid);
   		}
	}
}
	if(listid == UNDERCOVERSKINS)
	{
	    if(response)
	    {
    		SetPlayerSkin(playerid, modelid);
   		}
	}
}
	if(listid == FDUTYSKINS)
	{
	    if(response)
	    {
	        SetPlayerSkin(playerid, modelid);
		}
	}
}

Solution: remove the red brace. The blue braces, while valid code, serve no purpose and can also be removed.