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Use java 17, mixin does not support java 20

As the error says, you can't change the block states for vanilla blocks. Changing/re-registering vanilla registery objects is a bad way to do things anyway. * You will cause all sorts of conflicts with other mods * You will run into places where Mojang hard code things. A quick search of the 1.19.4 code finds 59 references to Blocks.GRASS_BLOCK alone (i.e. not your block) You should rethink what you are trying achieve. e.g. instead of trying to set a new "irradiated=true" property on the vanilla block, make your own "IrradiatedGrassBlock" and swap the block when it becomes irradiated. Or another way would be to keep track of the radiation levels in a Chunk Capability: https://forge.gemwire.uk/wiki/Capabilities Also; * Don't post logs in the forum where they are difficult to search (especially when there is more than one on a thread), use a file upload site. * Typically if you want help with your code, you need to post more than just a small snippet of it out-of-context, put your code on github where we can see everything that might be relevant.

These are the Forge support forums. We can't fix mods, we can only identify which one is causing the problem. You either need to contact the dawncraft modpack authors or the mod author directly: https://www.curseforge.com/minecraft/mc-mods/epicfight-dual-greatsword

Some conflict between epicfight mod and dualgreatsword. Error is for the dualgreatsword mod. Check you have the latest versions then contact the mod authors.