The problem with the world generation has been fixed, if you already used the old AFLR version, please delete the plugins/AlmostFlatLandsReloaded/Config.yml !
Please make sure that you are using the latest Spigot version, older versions may have some bugs
At the moment there are also no trees generated, because otherwise there will be a server crash; I think this will be a bukkit/spigot problem... ;/
Bugfixes:
+ Fixed a problem with the world generator.