mods.ic2.SemiFluidGenerator.addFluid doesnt work and gives an error even when example code is used. I talked with crafttweaker creator and he said its something to do with this mod not being updated.
The code example mods.ic2.SemiFluidGenerator.addFluid(liquid:water, 2333.0D);

[INITIALIZATION][CLIENT][ERROR] [crafttweaker]: Error executing {[0:crafttweaker]: IC2/semiFluidGenerator.zs}: ic2.api.recipe.ISemiFluidFuelManager.addFluid(Ljava/lang/String;ID)V
java.lang.NoSuchMethodError: ic2.api.recipe.ISemiFluidFuelManager.addFluid(Ljava/lang/String;ID)V

Minecraft version 1.12
Newest version of IC2

Just a reminder, "Newest version of IC2" is not a version number. You have to give the exact version number.

Solution for now is to downgrade IC2 version to 2.8.215. I believe I have "fixed" the same issue just now; whoever you talked to is correct about my mod being outdated, but the problem also involves API breaking change on IC2 side which is another headache.

Hello, thank you for the reply, the IC2 version is "industrialcraft-2-2.8.222-ex112.jar"
https://www.curseforge.com/minecraft/mc-mods/industrial-craft/files/3838713
my bad for not providing the exact version, i don't know what i was thinking back then when i submitted the issue.

https://www.curseforge.com/minecraft/mc-mods/ic2-tweaker/files/4083913

New version has been released. Please try and let me know if anything goes wrong.