Issue Description:
When adding a recipe for the Create mod's millstone I get the stated error.

What happens:
Error "Could not cast IData[] to List"

What you expected to happen:

The millstone to gain its new recipe

Script used (Please pastebin.com or gist.github.com your script, posting an unpasted or ungist'd script will automatically close this issue. We are NOT going to download files, do NOT upload your file to this issue, please give us a link to a paste / gist of the file):https://pastebin.com/Xjh58v8E

crafttweaker.log file (Please pastebin.com or gist.github.com your file, posting an unpasted or ungist'd file will automatically close this issue. We are NOT going to download files, do NOT upload your file to this issue, please give us a link to a paste / gist of the file.): https://pastebin.com/yG6T3Jst

Affected Versions (Do not use "latest"):

• Minecraft: 1.15.2
• Forge: 31.2.37
• Crafttweaker: 6.0.0.24
• Using a server: yes
• If yes, does the client have the exact same scripts? yes
  -Mod list: https://pastebin.com/iyGW4ehV

Your most recent log file where the issue was present (Please pastebin.com or gist.github.com your file, posting an unpasted or ungist'd file will automatically close this issue. We are NOT going to download files, do NOT upload your file to this issue, please give us a link to a paste / gist of the file.): https://gist.github.com/keeper317/36635372736acb36be1c1c73bd61cc4f

Would it be possible to get a new script and log using the latest 1.16 version?

No reply and we haven't had many reports of this lately.

I had a similar issue (except I was trying to make a vanilla written book with custom pages) and fixed it by importing IData:
import crafttweaker.api.data.IData;

Here's the script I was having trouble with, which the above solution fixed: https://pastebin.com/ndaYMveF