Hello. I just upgraded my MC version from 1.11 to 1.16.5, along with any plugins + bukkit. I moved the folder with the name of my world into the new Bukkit Server Folder and I am getting the following error when I load my map on Bukkit: java.lang.NoSuchFieldError: MUSHROOM_ISLAND Thank you so much for your help!
@SpiKe* There should be more text under that error. I am guessing this has to do with the 1.13 materials change.