Mine

jvm 1    | org.drftpd.exceptions.FatalException: Cannot create instance of usermanager, check master.usermanager in config file
jvm 1    |      at org.drftpd.GlobalContext.loadUserManager(GlobalContext.java:304)
jvm 1    |      at org.drftpd.GlobalContext.init(GlobalContext.java:390)
jvm 1    |      at org.drftpd.master.ConnectionManager.boot(ConnectionManager.java:145)
jvm 1    |      at org.drftpd.master.Boot.startApplication(Boot.java:41)
jvm 1    |      at org.java.plugin.boot.Boot.boot(Unknown Source)
jvm 1    |      at org.java.plugin.boot.Boot.main(Unknown Source)
jvm 1    |      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
jvm 1    |      at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
jvm 1    |      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
jvm 1    |      at java.lang.reflect.Method.invoke(Method.java:597)
jvm 1    |      at org.tanukisoftware.wrapper.WrapperSimpleApp.run(WrapperSimpleApp.java:240)
jvm 1    |      at java.lang.Thread.run(Thread.java:619)
jvm 1    | Caused by: java.lang.ClassNotFoundException: org.drftpd.usermanager.sql.SQLUserManager
jvm 1    |      at org.java.plugin.standard.StandardPluginClassLoader.loadClass(Unknown Source)
jvm 1    |      at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
jvm 1    |      at org.drftpd.GlobalContext.loadUserManager(GlobalContext.java:298)
jvm 1    |      ... 11 more
wrapper  | <-- Wrapper Stopped