Roughly Enough Items Crash: Entry type minecraft:item doesn't exist!

What the log looks like

java\.lang\.NullPointerException: Entry type minecraft:item doesn't exist!
Entry type minecraft:item doesn't exist![\s\S]{0,120}me\.shedaniel\.rei\.impl\.common\.entry\.type\.EntryTypeDeferred\.getDefinition

How to fix it

1. Update Roughly Enough Items (REI) and Architectury API to the latest build for your Minecraft version, as specific 1.20.x releases contained a bug when opening the config screen from the main menu.
2. Before opening REI settings from Mod Menu/Catalogue or connecting to custom multiplayer servers like Hypixel, load into any singleplayer world once per game session so REI can initialize its item types.
3. Avoid opening the REI configuration menu from the title screen; instead, open your inventory inside a world and click the REI wrench/config button directly.
4. If the error repeats every tick inside a singleplayer world, check latest.log for recipe parsing errors and remove or update mods that disable vanilla recipe book packets or add malformed custom crafting recipes.

Check your own log