OpenTerrainGenerator-1.12.2+-+v5
Biome_Bundle-1.12.2-v6.1
lostcities-1.12-2.0.2

When trying to translate from a Biome Bundle / OTG world to the Lost Worlds dimension, I get the following crash:
crash-2018-02-14_19.03.17-server.txt

I reported this to McJty on Lost Cities mod github (McJtyMods/LostCities#90 (comment)), but he recommended that I report it to you instead.

After some more testing I did manage to translate to a Lost Cities dimension once, and then while flying along it crashed again with the same error - so it seems to always be when you get in range of an Ocean biome.

Hey, thanks for reporting this, will test with Lost Worlds asap.

Another oddity is that any River biome created in the Lost Worlds dimension when OTG is the Overworld generator is still called a River biome, but looks like a cut-away section of extreme mountains - giant pillars of stone shaped like a river - very strange.

The Ocean crash is no longer happening with OpenTerrainGenerator-1.12.2+-+v6, but the river biomes are still the same. Must be a Biome Bundle issue rather than OTG though, as OTG + the new Dregora pack work fine with rivers when you translate to the Lost Cities dimension.

Thanks for reporting! Hopefully the river problem is also solved with v7, which uses dynamic biome id's for new worlds.