Bug Description

After updating the modpack to the latest version me and my friends weren't able to open the world because the message
"Datapack validation failed" appeared when opening the world

How to Reproduce?

No response

Expected Behavior

The world was supposed to launch normally

Version

v2.1.2

Logs or additional context

here's the log:
https://pastebin.com/Ga6AFj7G

Code of Conduct

• I have searched the issue tracker and confirmed that the issue has not been reported
• I have checked the FAQ (if one is present) and my issue is not listed
• I have verified that I am using the latest version of the modpack
• I have verified that I have followed the required steps to set up the modpack