Description of the Bug
Any time a dragon spawns from mod Dragon Mounts 2, it crashes minecraft and that world does not load again til either railcraft or dragon mounts 2 is removed from the mod pack.
Dragon Mounts 2 1.5.3:
https://minecraft.curseforge.com/projects/dm2?gameCategorySlug=mc-mods&projectID=297333

LLibrary 1.7.17
https://minecraft.curseforge.com/projects/llibrary/files

To Reproduce

1. Using Railcraft Beta 5
2. Add both DM2 and LLibrary above
3. Spawn Dragon = Instant crash
4. Reload world = Instant crash

Logs & Environment
Full last log from loading back into world with spawned dragon
https://www.dropbox.com/s/ifdublclz8je9g9/latest.log

Crash Reports:
Crash when spawned
https://pastebin.com/SCZJD7mE

Crash when tried to load back in
https://pastebin.com/5ttmZyQj

Did you report to the dragon mounts team? It seems to be them offering an invalid inventory for their dragon.

I will download that mod and spot the exact issue.

This particular code is very picky that mods follow the exact specification for Capabilties.

In other words, if it reports that it has a Capability, it must not return null when asked for that Capability.

I did report it to them as well first, any tips for me to pass along to them to try and make them compatible on their side?

Hello guys heres my the dragon entity: https://github.com/TheRPGAdventurer/dragonmounts2-1.12.2/blob/1.5.5/src/main/java/com/TheRPGAdventurer/ROTD/server/entity/EntityTameableDragon.java

Can you help me with whats going on?

ok I fixed the issuem it wass left out when i was copying someones "homework"