Could you check your loot tables? There seem to be a lot of errors that spam the log. E.g. https://pastebin.com/Pd6isxyh

mod version v1.4.7

All the comparability loot tables will try to load regardless. It shouldn't cause any issues though if you don't want it to cause clutter on your logs during launch you can just open up the jar file, navigate to data\carpetstairsmod\loot_tables\blocks and remove the .json files that are unused.

Maybe I'm wrong but it looks like it's trying to load mushroom mod compatibility loot tables even when there is no mushroom mod loaded.

Modpack creators are not allowed to host modified mods that others have created.

My latest log: https://gist.github.com/Yourname942/ed3eb0954466f83d8e62287223218fb4

Minecraft 1.15.2
Forge 31.2.36
Carpet Mod 1.4.7

Expected Behaviour
There should be no errors from your mod when all I did was create a new world and enter it.

1. Actual Behaviour
   Errors are being thrown due to code being executed for an optional mod that is not present in the modpack.

Steps to reproduce:

1. Select Play in Twitch App
2. Select Play in Minecraft Launcher
3. Create a new world
4. Enter world
5. Exit Minecraft

Potential Solution
An if else statement: (I know it is not javascript)
If Extra Mushrooms is in modpack, then execute that code

Thank you.