I have been trying to be Frankenstein and mix 2 modpacks together for my wife and I to both enjoy together. I downloaded both from curseforge, made a new modpack, shoved all of the mods in, and painstakenly went through all 300+ mods taking half of them out then slowly adding them in a handfull at a time until the game launched with as many mods as possible. I knew there were going to be some compatibility issues and have successfully gotten to the main menu. I went to create a new world and got the -1 crash report. I opened the report and took out the mods it said were incompatible until it no longer said anything more than... "// You're mean." 

I am trying to understand this report as from what other people have said, it sounds like fabric is needed but I don't see how that's possible when both modpacks are the same version of minecraft, using forge, and work individually. I do see in there stuff like this in the crash report:

Quote

mod:curios (incompatible), mod:corail_woodcutter, mod:advancednetherite, mod:searchables (incompatible)

Does this mean I have to go through what looks like 2/3s of all the mods in there and take them out? Or is there something else I'm missing? Please help

This is the crash report: 

https://paste.ee/p/E8dz1PCC

 

 

 

 

It is a conflict between snowundertrees and sereneseasons

Update sereneseasons:

https://www.curseforge.com/minecraft/mc-mods/serene-seasons/files/6229152

11 hours ago, TileEntity said:

It is a conflict between snowundertrees and sereneseasons

Update sereneseasons:

https://www.curseforge.com/minecraft/mc-mods/serene-seasons/files/6229152

OMG YOU'RE A LIFE SAVER! For future reference, where did you see in the log that was the issue?

The first lines mentioned it:

java.lang.NoSuchFieldError: seasons
	at bl4ckscor3.mod.snowundertrees.SereneSeasonsHandler.tryMeltSnowUnderTrees

So snowundertrees is already using compatibility features for sereneseasons

But this issue indicates that both mod builds are not matching

(snowundertrees expecting functions from sereneseasons which are not available -> outdated build)