Create Crash: Registry entry not present: create:copycat

What it looks like in the log

java.lang.NullPointerException: Registry entry not present: create:copycat

How to fix it

1. Open your game or server `mods` folder and locate the **Create: Steam 'n' Rails** jar file (usually named `Steam_Rails-...jar`).
2. Remove Create: Steam 'n' Rails from your `mods` folder, or replace it with a newer release that explicitly supports Create 6.0.x.
3. If you rely on Steam 'n' Rails and other older add-ons, downgrade the main Create mod (and your other Create add-ons) back to Create 0.5.1.j instead.
4. Restart your Minecraft client or server to confirm it finishes loading.

Check your own log