Description of the Bug
I'm honestly not sure. I was upgrading JEID but that was causing issues with Phosphor, so I downgraded it and upgraded Advanced Rocketry and now Railcraft is throwing an error.

To Reproduce

1. Place block/cart '...'
2. Click on '....'
3. See '...'

Honestly I never get in-game.

Expected behavior
Modpack to load

Screenshots & Video

Logs & Environment

• Full log: No fml-client-latest.log; this is latest.log however: https://gist.github.com/janagyjr/02a4889f01a02a0ab01321172be2a867

• Crash report (If available): https://gist.github.com/janagyjr/c050d50f1fa4d6b3d4841d42771ab889

Additional context

I'm just trying to get my modpack launching again so I can continue play-testing while Phosphor and JEID and Mixinbootstrap fix their crap.

Hmm, delete the railcraft folder in your config folder and try again

I'll move it out of my config folder to my desktop, deleting it with the custom configs isn't a good option (it is an option, just not a good one).

And it does nothing. The pack won't even load now.

Seems I'm still having problems with MixinServiceBootStrap
https://gist.github.com/janagyjr/5d7c8dadaee01283d6c749066f83ab10

fml

This one is not railcraft's fault. You need to find out which mods ship SpongePowered mixin and remove them one by one. If you have spongeforge consider renaming it to aSpongeForge so its mixin loads before other mixins and this problem may be avoided

There are several mods that I'm aware are using Spongepowered Mixin. Phosphor and JEID. I absolutely need the latter, and Phosphor enables me to play w/o using Optifine. This is seemingly related to:
https://github.com/jellysquid3/phosphor/issues/64

Closing this issue, thanks for the help.