Error on creating user in fresh install

I have setup a fresh 7.4.1 application server, put in our plugins, signed them and on the first visit of servoy-admin I am trying to create a new user as suggested.
However, after submitting the form, the page reloads without any content besides the header and navigation. In the .service_log, the following error appears:

INFO   | jvm 1    | 2014/06/24 17:17:33 | SEVERE: Servlet.service() for servlet servoy_server_admin threw exception
INFO   | jvm 1    | 2014/06/24 17:17:33 | java.lang.ClassNotFoundException: de.rtner.security.auth.spi.PBKDF2Parameters
INFO   | jvm 1    | 2014/06/24 17:17:33 | 	at java.net.URLClassLoader$1.run(Unknown Source)
INFO   | jvm 1    | 2014/06/24 17:17:33 | 	at java.net.URLClassLoader$1.run(Unknown Source)
INFO   | jvm 1    | 2014/06/24 17:17:33 | 	at java.security.AccessController.doPrivileged(Native Method)
INFO   | jvm 1    | 2014/06/24 17:17:33 | 	at java.net.URLClassLoader.findClass(Unknown Source)
INFO   | jvm 1    | 2014/06/24 17:17:33 | 	at java.lang.ClassLoader.loadClass(Unknown Source)
INFO   | jvm 1    | 2014/06/24 17:17:33 | 	at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
INFO   | jvm 1    | 2014/06/24 17:17:33 | 	at java.lang.ClassLoader.loadClass(Unknown Source)
INFO   | jvm 1    | 2014/06/24 17:17:33 | 	at com.servoy.j2db.util.Utils.calculatePBKDF2(Utils.java:1729)
INFO   | jvm 1    | 2014/06/24 17:17:33 | 	at com.servoy.j2db.util.Utils.calculateAndPrefixPBKDF2PasswordHash(Utils.java:1711)
INFO   | jvm 1    | 2014/06/24 17:17:33 | 	at com.servoy.j2db.server.dataprocessing.Zgb.createUser(Zgb.java:248)
INFO   | jvm 1    | 2014/06/24 17:17:33 | 	at com.servoy.j2db.server.servlets.ConfigServlet.Zk(ConfigServlet.java:2278)
INFO   | jvm 1    | 2014/06/24 17:17:33 | 	at com.servoy.j2db.server.servlets.ConfigServlet.service(ConfigServlet.java:3805)
INFO   | jvm 1    | 2014/06/24 17:17:33 | 	at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
INFO   | jvm 1    | 2014/06/24 17:17:33 | 	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
INFO   | jvm 1    | 2014/06/24 17:17:33 | 	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
INFO   | jvm 1    | 2014/06/24 17:17:33 | 	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
INFO   | jvm 1    | 2014/06/24 17:17:33 | 	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
INFO   | jvm 1    | 2014/06/24 17:17:33 | 	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
INFO   | jvm 1    | 2014/06/24 17:17:33 | 	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
INFO   | jvm 1    | 2014/06/24 17:17:33 | 	at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:615)
INFO   | jvm 1    | 2014/06/24 17:17:33 | 	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
INFO   | jvm 1    | 2014/06/24 17:17:33 | 	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
INFO   | jvm 1    | 2014/06/24 17:17:33 | 	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:861)
INFO   | jvm 1    | 2014/06/24 17:17:33 | 	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:606)
INFO   | jvm 1    | 2014/06/24 17:17:33 | 	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
INFO   | jvm 1    | 2014/06/24 17:17:33 | 	at java.lang.Thread.run(Unknown Source)
INFO   | jvm 1    | 2014/06/24 17:17:33 |

What’s wrong?

I found the problem. I copied a wrapper.conf from an old (Servoy 6) service directory. This is missing some classpath entries. After using a bundled wrapper.conf, everything works as expected!