ClassNotFoundException: me.jellysquid.mods.sodium.client.render.vertex.VertexBufferWriter

What the log looks like

java\.lang\.ClassNotFoundException:\s*me\.jellysquid\.mods\.sodium\.client\.render\.vertex\.VertexBufferWriter

How to fix it

1. Update Physics Mod to the latest version available for your Minecraft version if you have it installed, as older builds are a frequent cause of this specific crash.
2. Update all other Sodium-compatible rendering mods in your mods folder—especially Indium, Iris Shaders, Continuity, Entity Model Features, and ReplayMod—so they match your installed Sodium version.
3. Check the crash report stack trace right below the ClassNotFoundException line to identify the exact mod package calling VertexBufferWriter, and either update or remove that mod.
4. If an updated version of the conflicting mod is not yet available, downgrade Sodium to an older 0.4.x release that matches the mod's release date.

Check your own logDownload sodium on 9Minecraft