Melati Error

Reported from ConfigServlet

An error has occured in the application that runs this website, please contact nobody , with the information given below.

org.melati.poem.DatabaseInitialisationPoemException: Something went wrong trying to open the logical database `melatitest' 
org.melati.poem.InitialisationPoemException: You tried to create a record in the table group
but it failed post-initialisation tests.
The field group.description: String(-1) (from the data dictionary) had an illegal value
NULL is not an allowed value
---
org.melati.poem.NullTypeMismatchPoemException: NULL is not an allowed value
	at org.melati.poem.BasePoemType.assertValidRaw(BasePoemType.java:117)
	at org.melati.poem.JdbcTable.validate(JdbcTable.java:1916)
	at org.melati.poem.JdbcTable.create(JdbcTable.java:1971)
	at org.melati.poem.Column.ensure(Column.java:875)
	at org.melati.poem.GroupTable.ensure(GroupTable.java:125)
	at org.melati.poem.GroupTable.postInitialise(GroupTable.java:108)
	at org.melati.poem.Database.unifyWithDB(Database.java:524)
	at org.melati.poem.Database.access$000(Database.java:83)
	at org.melati.poem.Database$1.run(Database.java:268)
	at org.melati.poem.Database$3.run(Database.java:723)
	at org.melati.poem.PoemThread.inSession(PoemThread.java:159)
	at org.melati.poem.Database.perform(Database.java:721)
	at org.melati.poem.Database.inSession(Database.java:785)
	at org.melati.poem.Database.connect(Database.java:264)
	at org.melati.poem.PoemDatabaseFactory.getDatabase(PoemDatabaseFactory.java:202)
	at org.melati.LogicalDatabase.getDatabase(LogicalDatabase.java:142)
	at org.melati.Melati.setPoemContext(Melati.java:230)
	at org.melati.servlet.ConfigServlet.doGetPostRequest(ConfigServlet.java:176)
	at org.melati.servlet.ConfigServlet.doGet(ConfigServlet.java:148)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
	at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:502)
	at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:363)
	at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
	at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
	at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:766)
	at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:417)
	at org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:230)
	at org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114)
	at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
	at org.mortbay.jetty.Server.handle(Server.java:324)
	at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:534)
	at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:864)
	at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:533)
	at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:207)
	at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:403)
	at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409)
	at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:522)