"Attempted to spawn non-existing monster class"

[Elicorna]

Hello,

I have an event script that spawns a random MVP from an array, the problem is that some of the MVPs spawn just fine (beelzebub, Naght Sieger), and others don't spawn and throw this error in the logs:
 

[Warning]: buildin_monster: Attempted to spawn non-existing monster class 110037660

(the monster class number changes depending on the monster - this particular one is Naght Sieger).

I can't figure out why it's coming up with this error, I've checked my mob_db as well as done @mi IG to check and all the IDs in the script are correct.

As an example, from the various tests I've done (I launched the event multiple times in a row to see if I could find a pattern), FBH and Beelzebub spawn without issue, however GDB, Naght Sieger, Gioia and Valkyrie create an error.

This is the part of the script that concerns the monster summon:

 

OnInit:
	setarray [email protected][1],"1734","1708","1751","1956","1917","1929","1957","1874","3450","2319","2253","1871","2251","1768","3073","1832","2255","2022","2249","3074","3254";
	setarray [email protected]$[1],"Kiel D-01","Thanatos Phantom","Valkyrie Randgris","Naght Sieger","Wounded Morroc","Great Demon Baphomet","Entweihen Crothen","Beelzebub","Bijou","Buwaya","Daehyon","Fallen Bishop","Gioia","Gloom Under Night","Awakened Ferre","Ifrit","Kades","Nidhoggur's Shadow","Pyuriel","Timeholder","T W O";
	set [email protected],0;
	end;

OnTouch:
	donpcevent "UnknwnLght::OnCountS";
	if ([email protected] == 1) goto L_Nothing;
	if ([email protected] >= 0 && [email protected] <=5) 
	{
		setarray [email protected]$[1],"Kiel D-01","Thanatos Phantom","Valkyrie Randgris","Naght Sieger","Wounded Morroc","Great Demon Baphomet","Entweihen Crothen","Beelzebub","Bijou","Buwaya","Daehyon","Fallen Bishop","Gioia","Gloom Under Night","Awakened Ferre","Ifrit","Kades","Nidhoggur's Shadow","Pyuriel","Timeholder","T W O";
		mes "^3355FFVous remarquez que cette lumière dégage une extrême puissance.^000000";
		next;
		mes "^3355FFVous ne savez comment, mais elle vous force à visualiser un monstre dans votre esprit...^000000";
		next;
		set [email protected],select("Kiel D-01:Thanatos Phantom:Valkyrie Rangdris:Naght Sieger:Wounded Morroc:Great Demon Baphomet:Entweihen Crothen:Beelzebub:Bijou:Buwaya:Daehyon:Fallen Bishop:Gioia:Gloom Under Night:Awakened Ferre:Ifrit:Kades:Nidhoggur's Shadow:Pyuriel:Timeholder:T W O");
		mes "^3355FFVous avez choisi ^FF0000"[email protected]$[[email protected]]+"^3355FF...^000000";
	} 
	else 
	{
		mes "^3355FFVous remarquez que cette lumière dégage une extrème puissance.^000000";
		set [email protected],rand(1,56);
		if ([email protected] >= 1 && [email protected] <= 4) set [email protected],1;
		if ([email protected] == 5 || [email protected] == 6) set [email protected],2;
		if ([email protected] >= 7 && [email protected] <= 10) set [email protected],3;
		if ([email protected] == 11 || [email protected] == 12) set [email protected],4;
		if ([email protected] == 13 || [email protected] == 14) set [email protected],5;
		if ([email protected] == 15 || [email protected] == 16) set [email protected],6;
		if ([email protected] == 17 || [email protected] == 18) set [email protected],7;
		if ([email protected] >= 19 && [email protected] <= 22) set [email protected],8;
		if ([email protected] == 23 || [email protected] == 24) set [email protected],9;
		if ([email protected] == 25 || [email protected] == 26) set [email protected],10;
		if ([email protected] == 27 || [email protected] == 28) set [email protected],11;
		if ([email protected] >= 29 && [email protected] <= 32) set [email protected],12;
		if ([email protected] == 33 || [email protected] == 34) set [email protected],13;
		if ([email protected] >= 35 && [email protected] <= 38) set [email protected],14;
		if ([email protected] == 39 || [email protected] == 40) set [email protected],15;
		if ([email protected] >= 41 && [email protected] <= 44) set [email protected],16;
		if ([email protected] == 45 || [email protected] == 46) set [email protected],17;
		if ([email protected] == 47 || [email protected] == 48) set [email protected],18;
		if ([email protected] == 49 || [email protected] == 50) set [email protected],19;
		if ([email protected] >= 51 && [email protected] <= 54) set [email protected],20;
		if ([email protected] == 55 || [email protected] == 56) set [email protected],21;				
	}
	close2;
	monster "valkyrie",48,36,[email protected]$[[email protected]],[email protected][[email protected]],1,"MobUnknw::OnDead";
	mapannounce "valkyrie","Le monstre invoqué est "[email protected]$[[email protected]]+" !",bc_map,"0x70DBDB";
	set [email protected],1;
	initnpctimer;

Thanks in advance for any help.