I have double checked my sieveregistry.json file with jsonlint.com

I have checked and made sure ex nihilo creatio mod and its dependency are up to date, and they are unless ive missed something.

Pastebin of Sieve Registry: https://pastebin.com/r2vFWaHN

Config file: https://pastebin.com/PKDNJpU3

If you need anything else let me know.

I solved my own issue. Upon further investigation the sieveregistry.json file had entries in there for mods no longer in the pack, and for some reason - rather ExNihiloCreatio skipping over these entries, for some reason it was marking the entire JSON invalid... After removing the Applied Energistics 2 and Natura entries the sieve registry loaded completely fine. Advise to add a feature in the mod to make erroneous or non existing entries in the sieve registry be skipped, rather than forcing someone to have to manually edit it every time a mod is removed or disabled for some reason.