Version Information 1.16.5

Forge version: 1.16.5-36.2.5
Botania version: Botania-1.16.5-419

Further Information

Link to crash log: https://pastebin.com/C0afBx5M
Steps to reproduce:

1. make a forge 1.16.5-36.2.5 server
2. install mods + botania
3. start server
4. see crash log

What I expected to happen:
no crashes.
What happened instead:
server crashed with crashlog saying botania mod has issues.

Somehow the mixin didn't apply? Post contents of debug.log directly (your copy from the console is lacking some info and is pretty unreadable), and try running with Java 8.

https://pastebin.com/WV1TTk7q

Normally i also use Baubles. But I saw that one isnt up to date (latest is 1.12.2) Do I still need to use that one or is it also possible without?

Welp, that explains everything.
There is an issue where if you don't satisfy all the required dependencies, mixin connectors are not found.

As the CurseForge page for Botania (specifically, the page for the file you are using), you need to add Curios API and Patchouli.

Hi. I tried this again by only having Botania, Curios API and Patchouli in my mods folder and it still crashes.
the server run

I used this versions:
Botania-1.16.5-419.jar
curios-forge-1.16.5-4.0.5.3.jar
Patchouli-1.16.4-53.2.jar

Server console log: https://pastebin.com/aJW1GVvX
debug log: https://pastebin.com/CW6yq8Nf

Your logs don't mention Mixin at all outside of our package names, which means there is something deeply wrong with your installation. Try reinstalling the Forge server, and try launching with Java 8.