so i can start the game fine but when exiting and loading it back up i get this The mod Golden Age: Skybound (0.22.12) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event golden-age-skybound::on_configuration_changed
LuaEntityPrototype doesn't contain key max_health.
stack traceback:
[C]: in function 'index'
...-skybound/scripts/utilities/unified_asset_registry.lua:100: in function 'base'
...-skybound__/scripts/utilities/unified_asset_registry.lua:173: in function 'register_starships'
...-skybound__/scripts/utilities/unified_asset_registry.lua:267: in function 'rebuild'
golden-age-skybound/scripts/systems/fleet_manager.lua:86: in function 'rebuild'
golden-age-skybound/scripts/systems/fleet_manager.lua:127: in function 'on_configuration_changed'
...e-skybound__/scripts/lifecycle/configuration_handler.lua:21: in function <...e-skybound__/scripts/lifecycle/configuration_handler.lua:10>
(...tail calls...)
golden-age-skybound/control.lua:14: in function <golden-age-skybound/control.lua:13>

oof! sorry about that, sending out a hotfix now

does adding the mod need to start a new game as i had to remove it ?

no you should be able to load it right back in. i would make a backup save to test the load just in case though.