Crash on server side
forge-1.12.2-14.23.5.2815-universal.jar
solcarrot-1.12.2-1.3.4.jar
https://paste.ubuntu.com/p/ZdJPbJg37P/

I'm not 100% sure, but this is probably because ItemFoodBook, whose instantiation is causing the error, directly imports and works with the GuiFoodBook object. This could probably be avoided by using something like player.openGui(SOLCarrot.instance, GUI_ID, world, pos.getX(), pos.getY(), pos.getZ()); rather than Minecraft.getMinecraft().displayGuiScreen(new GuiFoodBook(player));

I have the same issue i think its a compat issue with the newest apple core mod version https://pastebin.com/Gnm3uUEL

That's the same issue, all right. But it's not a compatibility issue; I fixed it already (hence the issue being closed). This fix will be in the next update :)