Description of the Bug
Producing (at least) something on Manual Rolling Machine will cause a server crash on SpongeForge Server. And there will be java.lang.IncompatibleClassChangeError in the Crash-report.

To Reproduce

1. Place a Manual Rolling Machine anywhere
2. Right click to open GUI of the Manual Rolling Machine
3. Put a Iron Ingot into it
4. Click Track Parts and wait for its completion

Expected behavior
A Track Part should be made normally without crash.

Logs & Environment

• Environment:
  Forge version 1.12.2-14.23.5.2779
  Sponge version 1.12.2-2768-7.1.4
  Railcraft version 12.0.0-beta-2
• Full log:
  debug.log
  latest.log
• Crash report (If available):
  Crash-reports-server.txt

Sponge bug.

@CovertJaguar Apparently sponge doesn't want our inventory to implement iterable for something other than Iterable<org.spongepowered.api.item.inventory.Inventory>. Blame Mumfrey.

They make a change like that and expect it to break nothing? Lol.

Closing due to Not Railcraft

I think I will start working on the sponge compat soon, at least fixing this thing