The error is due to an update in Giga's, they changed the identifier for negative mass to giga_sr_negative_mass rather than ehof_sr_negative_mass
Change all mentions of the latter to the former to reactivate functions without removing the cost; this can be done with ctrl+f and any notepad app of your choosing

i had the same issue as the user below. i was able to fix it by editing the mod file and removing all mentions of ehof negative mass, and despite still displaying the requitement, it works. here's some steps. i'm on 4.0

navigate to ~/.local/share/Steam/steamapps/workshop/content/281990/3286060146/ (i'm on linux, but if you're using irony you can just open the file)
edit /events/htm_event.txt
remove all mentions of negative mass (THE WHOLE LINE)
save
profit

hypertraversal still works but when trying to attract a supermassive black hole it says it needs 10k dark matter and 10k of a resource that isnt listed and the name doesnt show in the tooltip even when using instant build and give resource command it doesnt work

4.0 update when?

it should assuming the two mods it relies on havent been changed

this work for the newest update?

quasarcraft was joined into hyperquasaric megaconstruction

This Gargantuan Quasarcraft Mod been removed？

Could you either add or make a mod that does the same thing but adds O-Class stars as well? Thanks in advance either way, really enjoying summoning 100 supermassive black holes lol

thats extremely odd.
probably a mod list issue, id love to know if anyone else has this issue so i can figure out what specifically is causing it

I'm not too sure if there is anything with my mod configs, however the supermassive black holes and hyperquasars aren't considered of their class (I can make attack moons out of them for some reason with celestial warships mod for example) works perfectly with all the other star classes though hmmmm.

that is now a planned feature

maybe a mod to allow attracting class o aswell?

awsome dude, thank you so much