Open Server crash after 1.11.0->1.12.1 upgrade

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Summary of the problem Server crash after 1.11.0->1.12.1 upgrade

Pack Version 1.10.0

What is the bug? Server crashes before finishing loading on my map.

version 1.12.1 actually, can't select it in dropdown.

Mod & Version Probably IC2 mod, which is packed in this modpack, judging by exception.

Link to log file https://pastebin.com/XLjZxA8R

Is it repeatable? yes, one just needs to try starting the server with my map, I can share it if needed.

Known Fix