Modpack version
1.66c

Can the issue be reproduced?
Yes. By disabling and enabling Phosphor.

Logs
https://pastebin.com/cN0rFTZW

Issue
The pack crashes during startup. The minecraft loading screen wouldn't even load.

Did you modify the pack in any way? Add mods, change config etc.

Without knowing which versions you're running I can't check if I can reproduce it. I am running our servers and clients with LagGoggles installed and it works flawlessly with version 4.6.

Either way, glad to hear you have resolved your issue. I'm closing this for now.

I added a couple: LagGoggles, VanillaFix, Optifine, InGameTime(r). Didn't change any configs

@NillerMedDild: I am also running with LagGoggles and VanillaFix. Those work fine for me.

@TheMCProf: Optifine does cause crashes for me at times. So I stopped using it.
Additionally, are you using Sponge?

No, I don't use Sponge.
Also, I found out what was causing the problem - LagGoggles. I could load the modpack again after disabling it, but it worked fine in previous versions of the pack.