This might be real or I might be dumb. anyhow I go into creative mode on single payer and click the arrow that countesses the mods and as soon as I do my game crashes. Plz help me out here.

i am no longer working on eureka

it also sounds like this might not be an issue with eureka but another mod, please look at your crashlog to see what is crashing (if you don't know upload it to gist or pastebin and provide the link, without it i have no idea what the problem might be)