I am trying to get the newest version of spigot, because it said I was running 6 versions behind (via the versions command) and I was having some problems with other plugins... When it got to "Applying: Convert players skulls async" it gave some errors and crashed... the immediate error is "error: sha1 information is lacking or useless (src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaSkull.java)."