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it's telling you exactly what's wrong you have duplicates of the same mod in your mods folder now that its not running out of RAM it's crashing because they're conflicting

Try lauching your server with thisjava -Xms512m -Xmx4096M -XX:permSize=256m -jar Serverjarnamehere.jar nogui

have you ran a Profiler like opis or tickprofiler if nothing shows up on those i have seen Blood magics orchestra of the phantom hands wreck a server and be invisible to profilers

Well nodefclassfound errors are usually due to old java but it looks like you have 1.8 so on a long shot do you have -jar in front of your server jar in the startup script?

To me it looks as if something has gotten corrupted somewhere unfortunately it doesnt say what its trying to load if your on windows i would say use processhacker to look at open file handles while its trying to start but other then that it may be very hard to track down

i can give you 2 options for lag hunting that i know of first you can search for Yives mirror as that site hosts the kcauldron mobius core or you can use nallar's TickProfiler With Opis tho you may run into a issue with mapwriter crashing your client due to rendering issues with the Chisel mod...

most of the time when you get NoSuchMethodError its due to the java being older then what the mod requires