In order to keep your game clean and bug-free, the best way to go about mod installation is through the Forge client. Let's go through the steps needed to set up the environment for installing mods.

at org.spongepowered.asm.mixin.transformer.MixinProcessor.applyMixins(MixinProcessor.java:392) ~[mixin-0.8.4.jar:0.8.4+Jenkins-b308.git ...

Sky Factory is a famous modpack where players start with one tree on one dirt block and they need to survive. This turns the vanilla experience of the game, where players have an abundance of space ...

As Morph has just been rewritten and released for MC 1.16.5, I am clearing the issue tracker as I have not provided any support Morph for 1.12.2 and earlier. My apologies for not addressing your issue ...