Spawn Blaze Error

[Snobi_]

So, i'm currently making a Manhunt skript, where i let people edit the blaze spawning, so you can set
{better-manhunt.spawn.rate.blaze} (how many blazes there spawns), to make it easier. But whatever i write, it gets an error. Either it says "Event-Entity is not a world" or "Could not understand effect/condition." Here you got the code:

spawn {better-manhunt.spawn.rate.blaze}-1 blaze at location of event-entity

Can anyone fix this?

 

[Minecoll_YT]

spawn {better-manhunt.spawn.rate.blaze}-1 of blaze
But I hope you don't use this variable in a script you want to publish, if yes... just. Just use list variables.