SeaBlock/data-updates.lua:645: attempt to index field 'hydrogen' is the error message i get. I updatet all the mods by the internal mod-button in the game.
So I'm playing with factorio 0.17.28 and Seablock is 0.3.3 and the other dependant mods are up to date and installed.

Any Sugestions?

Having the same issue and i have no idea. Ive tried on multiple versions of factorio 0.15 and up. so i hope someone has any ideas

https://forums.factorio.com/viewtopic.php?f=190&t=43759

Download the ZIP from there.

They haven't done the Dependencies correctly