This mod seems to not be compatible with the cargo ships mod. this isn't really a bug, just an incompatibility.

I cannot reproduce the problem, if i install

https://mods.factorio.com/mod/cargo-ships
and
https://mods.factorio.com/mod/Roboport_and_Radar_MK2

I can see both buildings in the technology tree and when unlocked,
both items show up in the crafting menu and can be build onto ground.

it happened to me too now,
error loading mods:
failed to load mods: Error while running setup for entity prototype "or_radar" (radar): next_upgrade target (radar-mk2) must have the same bounding box.

(other plugin caused it btw, not yours)