Need help with the script for invasion event

[Ruhn]

	OnOdinDead:
		killmonster "odin_tem03","OdinTempInvasion::OnInvasionOdin";
		killmonster "prontera","OdinTempInvasion::OnInvasionOdin";
		announce "["+ strcharinfo(0) +"] has slain "+ getmonsterinfo(killedrid, MOB_NAME), bc_all;

		// Reward tracking
		MVPKills = MVPKills + 3;
		dispbottom "---------------------------------------------------";
		dispbottom "You killed a total of "+MVPKills+" MVP"+((MVPKills == 1)?"":"s")+".";
		#mvp_points += 3;
		dispbottom "You've gained three points! Your total is ["+#mvp_points+"] MvP point(s).";
		dispbottom "---------------------------------------------------";

		// Drop items around boss location
		set @item_id, 512; // 
		set @drop_count, 10;
		set @x, 113;
		set @y, 71;
		set @i, 0;
		while (@i < @drop_count) {
			set @dx, @x + rand(-3,3);
			set @dy, @y + rand(-3,3);
			makeitem @item_id, 1, "odin_tem03", @dx, @dy;
			set @i, @i + 1;
		}

		// Drop items around boss
		set @item_id, 512;
		set @drop_count, 10;
		set @x, 113;
		set @y, 71;
		set @i, 0;
		while (@i < @drop_count) {
			set @dx, @x + rand(-3,3);
			set @dy, @y + rand(-3,3);
			makeitem @item_id, 1, "odin_tem03", @dx, @dy;
			set @i, @i + 1;
		}

		// Distribute rewards
		set @players, mobcountunitdmg(killedrid, 0);
		set @item_reward, 1;
		set @highest_dmg, 0;
		set @highest_dmg_id, 0;
		set @i, 0;
		while (@i < @players) {
			set @char_id, getunitdmginfo(killedrid, @i, 2);
			set @account_id, getunitdmginfo(killedrid, @i, 0);
			set @dmg, getunitdmginfo(killedrid, @i, 1);

			if (@dmg > @highest_dmg) {
				set @highest_dmg, @dmg;
				set @highest_dmg_id, @account_id;
			}

			if (attachrid(@char_id)) {
				getitem @item_id, @item_reward;
				detachrid;
			}
			set @i, @i + 1;
		}

		// Double reward to highest damage dealer
		if (attachrid(getcharid(3, @highest_dmg_id))) {
			getitem @item_id, @item_reward;
			detachrid;
		}

		// Double reward to last hitter (current player)
		getitem @item_id, @item_reward;

		end;
}

Why am I getting an error on this script? Can someone help me in fixing the script here?
See attached screenshot for the error.

[Racaae]

The commands/functions getunitdmginfo and mobcountunitdmg are custom. These commands are not part of the default scripting commands, you need to add (or remove) them so the script can work.

[Ruhn]

6 hours ago, Racaae said:

The commands/functions getunitdmginfo and mobcountunitdmg are custom. These commands are not part of the default scripting commands, you need to add (or remove) them so the script can work.

do we have an alternative for those functions?