Describe the bug
A clear and concise description of what the bug is.
Crash log if it's a crash.
Info on what other mods you're using that may cause a conflict here if applicable.
https://mclo.gs/F7zO0y8
Please go to Discussions to add new feature requests / suggestions or comment on existing ones.

To Reproduce
Steps to reproduce the behavior:

1. craft any item (upgrade backpack, craft items from other mods)
2. Crash

Expected behavior
the game not to crash

Screenshots
If applicable, add screenshots to help explain your problem.

Versions
Mod version that you're using. Version of forge may also be helpful in some cases

you need to update backpacks as well not only core as now you have newer version of core that's not supported by the older version of backpacks