Version Information

Minecraft version: 1.12.2
Forge version: 14.23.5.2860
Other mods (if applicable):

Steps to reproduce:

1. Drag CubicChunks-1.12.2-0.0.1262.0-SNAPSHOT-all.jar into mods folder
2. Launch Minecraft
3. Create New World with Cubic Chunks Enabled

Expected Behaviour:
Minecraft loads into the world

Actual Behaviour:
Minecraft crashes while creating world

Link to crash log (if applicable - use a site such as hastebin: https://hastebin.com/share/pimudajici.php

Same issue. Per GL info: ~~ERROR~~ RuntimeException: No OpenGL context found in the current thread., guessing it might be due to AMD GPU (RX5700). Downgrade to Java 8u51 didn't work. Downgrading Forge didn't work.

I have an RTX 3060

I have same issue

Same issue.
Per GL info: ~~ERROR~~ RuntimeException: No OpenGL context found in the current thread., guessing it might be due to AMD GPU (RX5700).
Downgrade to Java 8u51 didn't work.
Downgrading Forge didn't work.

@jbax1899 do you know version of Cubic World Gen above 1254 that is working? Its either not loading into the game for me because some error, or its crashing when loading a world

@jbax1899 do you know version of Cubic World Gen above 1254 that is working? Its either not loading into the game for me because some error, or its crashing when loading a world

Looks like 1259 is the newest working.

@jbax1899 i dont think its problem with cubic chunks, its problem with Cubic World Gen. Any version that i try has critical errors, i either cant load into a world, or i mod is not loading into the game

@kotav1322 Here's what I've gotten to work:
(mind I'm not sure what all here is relevant)
Java 8u51
Mods:

@jbax1899 thanks! Its working for me!

Same issue. Per GL info: ~~ERROR~~ RuntimeException: No OpenGL context found in the current thread., guessing it might be due to AMD GPU (RX5700). Downgrade to Java 8u51 didn't work. Downgrading Forge didn't work.

This seems to be a different issue not related to the one OP reported. Would you mind sending a full crash report?

Here: https://pastebin.com/Uu6XYYXw. You said it was graphics card related, I just updated my NVidia drivers and it seems like the problem has fixed itself. Keep this open for other people who have this issue.