I've installed just the base dependencies for SeaBlock Pack and have gotten an error that prevents me from starting a game. It reads:

The mod Cargo Ships (1.0.33) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event cargo-ships::on_init()
"offshore-oil" is not a valid autoplace control name.
stack traceback:
[C]: in function 'newindex'
__cargo-ships/logic/mapgen.lua:11: in function 'oil_generation_migration'
cargo-ships/control.lua:569: in function 'init'
cargo-ships/control.lua:581: in function <cargo-ships/control.lua:580>

This should be fixed already This happens if you use SeaBlock 1.1.0 with factorio 2.1 and cargo-ships. with SeaBlock 1.1.1. (Not the modpack)
Which version of Factorio and SeaBlock are you using?

Oh, I've just been on the main release of the game (which is Factorio 2.1). Meanwhile, I'm using 1.00 of Seablock 2, and 1.01 of SeaBlock Pack. What version should I be running for the modpack to work well?

Main release is still 2.0. 2.1 is Experimental: https://factorio.com/

1.1.1 of the ModPack will work with 1.1.1 of the Mod and Factorio 2.1. The new (optional dependencies of CargoShips killed the original game.) I could add a dependency to the Mod version. But I assume the people wo do not update the Mod itself won't update the ModPack so a new dependency because of the dependencies is kind of useless.

You can just disable "Cargo Ships: Oil Rig". That is the wohle point of the 1.1.1 versions: If Oil Rig is installed Cargo Ship wants to change them. But Since I remove all crude oil sources there won't be any to change. So I get rid of the Oil Rig mod.
Maybe I just delete the 1.1.0 versions...

So for updated SeaBlock for Factorio 2.0. So now there is a 1.0.1. This should fix your problems. I hope you are still reading...

Yerp, I can play and so far it's great! Thx for the modpack, the official Seablock for 2.0 is probably a long way aways.

Thanks for the reply