Custom Set Quest World Error ?

[jackbot2]

've recently been trying to make a pauper quest world. In order to do this, I created a few new sets that just contained commons. I then created a world in the quest world.txt, made a block for them, added a draft ranking. So far everything has worked, except about half the time after I win a match, I get this error after I win the match, but before I choose which pack to choose from. I cannot tell if it is an error in my set or if forge is trying to award me a rare for winning but since the sets contain no rares or uncommons it is producing an error. I will attach one of the sets I created.
Thanks.

[RumbleBBU]

I think you might be right. The game probably doesn't handle well situations where there are no uncommon, rare or mythic rare cards available in the current format.

You could try changing the card rarities in the set definitions slightly. Make some of them uncommon and rare (or maybe even mythic rare). Then change the distirbution line in your set definition to something like "Booster=5 Common, 5 Uncommon, 5 RareMythic", so your uncommons and rares won't be de facto any less common than your 'commons' (well, your mythic rares would obviously be, though).