[Help?!?]

I have been sinking hrs into Pokémon Reju on my Mac for days now and as I was playing today my game crashed and left me a “end of file” error now anytime I open it I get that error and it closes I have no idea how to fix this and I would love some help 

[Rejuvenation Modular Modpack [V12.1]]

ok thank u

 

[Rejuvenation Modular Modpack [V12.1]]

Ok, so i have the mod installed and sorted how i like but i want to know if i can check my route 3 mystery egg and change it if needed im new to all this and would love some help let me know if this is the wrong thread to ask in