I would say trail and error with the mods.
#crash upon hosting private server
scarlet lion
Trial*
Just play with each mod slowly removing one until it works
When you find which mod is causing it you cant play with it with those other mods.
stable lake
it seems like IOI is broken, but its a mod made for kyber
i guess theres no compat between b+ and ioi
sinful epoch
What's your mods collection ?