I've spent two days trying to figure out what was wrong, and the only time I was able to run Minecraft was when I disabled the Tinker's integration.

crash-2019-05-29_14.54.48-client.txt

the checks for some bits should be centralized, yes, but there should also be checks in individual mods

@dshadowwolf The alloy logic goes through MMDLib, right? Would we be better off adding a general check to see if all ingredients and outputs exist before registering an alloy in MMDLib or would we prefer a check in each of the Metals family mods?

Perhaps a check on MMDLIb's side, with a log mentioning what ingredients are missing, the alloy name and the mod trying to register it. Does this sound feasable?

I had thought we had checks (remaining from before the split) in all the mods using the integration, actually - knowing that it isn't there is... annoying. I'd say this should be easy, but I do believe the integration works in raw Ingredients/ItemStacks and not in MMD's internal representations, so I don't know that we'd have an easy way to check.

Perhaps we need to extend the integration to include a means to pass checks and such to the code ?

...and I thought we'd squashed this - what has happened is you have turned off, say, 'Coal' but still have 'Steel' active (this is an example) and have found a bug I thought we'd stomped out before releasing -rc2. Possibly linked to some issues around Prismarine.