Can someone help me please with Yellhandler?

Hey guys can someone help me ? why im getting those errors... [Only registered and activated users can see links. Click Here To Register...]

Code:

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package com.rs.game.player.content.custom;

import com.rs.game.World;
import com.rs.game.player.Player;
import com.rs.utils.DisplayNames;

public class YellHandler {
       
        public static boolean isValidText(Player player, String message) {
                String[] invalid = { "<euro", "<img", "<img=", "<col", "<col=", "<shad", "<shad=", "<str>", "<u>" };
                for (String s : invalid)
                        if (message.contains(s)) {
                                player.getPackets().sendGameMessage("You cannot add additional code to the message.");
                                return false;
                        }
                return true;
        }

        public static void sendYell(Player player, String message) {
                if (isValidText(player, message)) {
                        for (Player players : World.getPlayers()) {
                                if (players == null || !players.isRunning())
                                        continue;
                                players.getPackets().sendGameMessage(""+RightsManager.getInfo(player, player.getRights())+": "+message+"");
                } else if(player.isExtremeDonator() && player.getRights() == 0) {
                                players.getPackets().sendGameMessage("[Extreme Donator]: "+ "<img=10>"+player.getDisplayName()+": <col=C000FF>"+message+"</col>");
                                }
                }
                return;
        }
       
}

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