Thanks, I've contacted the mod creator, and the problem was caused by the new version of Forge. Going back a few versions fixed the problem!
Posts by Kuzenbot
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Hey there, I'm pretty new to server hosting, and I'm starting a modded server in 1.16.3 using a dozen mods or so.
However, when Immersive Engineering is installed, the server crashes before it's even online, has anyone experienced similar issues?
(I'm using a slightly outdated version of the mod because the most recent one has caused various OpenGl errors in my testings)
Here is the log: