Mods

When ever I try to open the  game on 1.16.3-forge-34.1.32 (the latest version for now) it comes up with a crash message, even when I take out all my mods:   I've even reinstalled Forge and the Minecraft Launcher.   Please respond    Thanks 😀

I'm playing on Forge version 1.16.1, and only have 2 mods installed: Quark 1.16.1 and AutoRegLib 1.16.1. When I try to create a new world it gives me the pop-up "Errors in currently selected datapacks prevented world from loading. You can either try to load only with vanilla datapack ("safe mode") or go back to title screen and fix it manually. I can't choose safe mode, either. Is there a fix to this?  

I want to create a / noclip command but I don't know how to start

Hi, I have successfully setup a json model to render in game, however when I place it you can see through the world. Is there a way to fix this or will I have to use an OBJ model? Another issue is that the model is the size of a full block, is there anyway to fix this as well?  

Hi, I am using Forge 1.12.2 - 14.23.5.2854 with IntelliJ IDEA 2020.2 (Community Edition). And every time I press runClient everything is going well, but at the end of everything I get the java.lang.IllegalArgumentException even with absolutely clear new example mod. My minecraft runs properly and it even sees my main mod file, but it seems like it can't see my resources package. Everything I put there including mcmod.info and some textures and jsons are not loaded. I'm only starting here, so I can't even imagine where the problem could be. For checking I used the very standard example mod, so I see no point in putting any code here.