PandasDT

Hey there, I am playing a modpack called Craft to Exile Dissonance. It uses MC 1.15.2 and the server will start up just fine when I let it pre generate a world but if I make a world in single player and then take that world folder and put it on the server and name it the same thing as in the server.properties file it just wont finish starting up. Im not sure what to do and ive asked around and noone has offered any advice so thought I would try here. Any help is greatly appreciated.