Ore generation condition

I took a look at many tutorials from the community and mccreator but I just can't figure it out.

I've discovered mccreator yesterday.

So, I created an ore block that generate between 1 and 5 in the overworld. But it needs one condition to generate, you need to kill the EnderDragon.

I made this but the additional generation condition tells me "missing dependencies" I overheated my brain and found out that x,y,z were the dependecies missing. Well that's how I understand the problem. I literally have no clue of what to do now.