[MAESTRO] probleme de suppression de group

je souhgaite supprimer un group ne possedant plus de projet mais j'obtient l'erreur suivante :
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INFO   | jvm 1    | 2007/03/01 14:37:53 | 2007-03-01 14:37:53,092 [SocketListener0-0] INFO  Interceptor:pssAutoLoginInterceptor - User already authenticated.
INFO   | jvm 1    | 2007/03/01 14:37:53 | 2007-03-01 14:37:53,092 [SocketListener0-0] INFO  Interceptor:pssSecureActionInterceptor - not a secure action org.apache.maven.continuum.web.action.ProjectGroupAction
INFO   | jvm 1    | 2007/03/01 14:37:53 | 2007-03-01 14:37:53,130 [SocketListener0-0] INFO  Interceptor:exceptionLogging   - Error ocurred during execution
INFO   | jvm 1    | 2007/03/01 14:37:53 | javax.jdo.JDODataStoreException: Delete request failed: DELETE FROM PROJECTGROUP WHERE ID = ?
INFO   | jvm 1    | 2007/03/01 14:37:53 |       at org.jpox.store.rdbms.request.DeleteRequest.execute(DeleteRequest.java:274)
INFO   | jvm 1    | 2007/03/01 14:37:53 |       at org.jpox.store.rdbms.table.ClassTable.delete(ClassTable.java:2471)
INFO   | jvm 1    | 2007/03/01 14:37:53 |       at org.jpox.store.StoreManager.delete(StoreManager.java:836)
INFO   | jvm 1    | 2007/03/01 14:37:53 |       at org.jpox.state.StateManagerImpl.internalDeletePersistent(StateManagerImpl.java:4217)
INFO   | jvm 1    | 2007/03/01 14:37:53 |       at org.jpox.state.StateManagerImpl.deletePersistent(StateManagerImpl.java:4172)
INFO   | jvm 1    | 2007/03/01 14:37:53 |       at org.jpox.AbstractPersistenceManager.internalDeletePersistent(AbstractPersistenceManager.java:1393)
INFO   | jvm 1    | 2007/03/01 14:37:53 |       at org.jpox.AbstractPersistenceManager.deletePersistent(AbstractPersistenceManager.java:1404)
INFO   | jvm 1    | 2007/03/01 14:37:53 |       at org.codehaus.plexus.jdo.PlexusJdoUtils.removeObject(PlexusJdoUtils.java:119)
INFO   | jvm 1    | 2007/03/01 14:37:53 |       at org.apache.maven.continuum.store.JdoContinuumStore.removeObject(JdoContinuumStore.java:1067)
INFO   | jvm 1    | 2007/03/01 14:37:53 |       at org.apache.maven.continuum.store.JdoContinuumStore.removeProjectGroup(JdoContinuumStore.java:1021)
INFO   | jvm 1    | 2007/03/01 14:37:53 |       at org.apache.maven.continuum.DefaultContinuum.removeProjectGroup(DefaultContinuum.java:234)
INFO   | jvm 1    | 2007/03/01 14:37:53 |       at org.apache.maven.continuum.web.action.ProjectGroupAction.remove(ProjectGroupAction.java:73)
INFO   | jvm 1    | 2007/03/01 14:37:53 |       at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
INFO   | jvm 1    | 2007/03/01 14:37:53 |       at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
INFO   | jvm 1    | 2007/03/01 14:37:53 |       at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
INFO   | jvm 1    | 2007/03/01 14:37:53 |       at java.lang.reflect.Method.invoke(Method.java:324)
INFO   | jvm 1    | 2007/03/01 14:37:53 |       at com.opensymphony.xwork.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:364)
INFO   | jvm 1    | 2007/03/01 14:37:53 |       at com.opensymphony.xwork.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:216)
INFO   | jvm 1    | 2007/03/01 14:37:53 |       at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:190)
INFO   | jvm 1    | 2007/03/01 14:37:53 |       at org.apache.maven.continuum.web.interceptor.ForceContinuumConfigurationInterceptor.intercept(ForceContinuumConfigurationInterceptor.java:58)
INFO   | jvm 1    | 2007/03/01 14:37:53 |       at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:188)
INFO   | jvm 1    | 2007/03/01 14:37:53 |       at org.codehaus.plexus.security.ui.web.interceptor.SecureActionInterceptor.intercept(SecureActionInterceptor.java:156)
INFO   | jvm 1    | 2007/03/01 14:37:53 |       at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:188)
INFO   | jvm 1    | 2007/03/01 14:37:53 |       at org.codehaus.plexus.security.ui.web.interceptor.AutoLoginInterceptor.intercept(AutoLoginInterceptor.java:83)
INFO   | jvm 1    | 2007/03/01 14:37:53 |       at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:188)
INFO   | jvm 1    | 2007/03/01 14:37:53 |       at org.codehaus.plexus.security.ui.web.interceptor.ForceAdminUserInterceptor.intercept(ForceAdminUserInterceptor.java:59)
INFO   | jvm 1    | 2007/03/01 14:37:53 |       at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:188)
INFO   | jvm 1    | 2007/03/01 14:37:53 |       at org.codehaus.plexus.security.ui.web.interceptor.EnvironmentCheckInterceptor.intercept(EnvironmentCheckInterceptor.java:123)
INFO   | jvm 1    | 2007/03/01 14:37:53 |       at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:188)
INFO   | jvm 1    | 2007/03/01 14:37:53 |       at org.codehaus.plexus.xwork.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:62)
INFO   | jvm 1    | 2007/03/01 14:37:53 |       at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:188)
INFO   | jvm 1    | 2007/03/01 14:37:53 |       at com.opensymphony.xwork.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:168)
INFO   | jvm 1    | 2007/03/01 14:37:53 |       at com.opensymphony.xwork.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:86)
INFO   | jvm 1    | 2007/03/01 14:37:53 |       at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:188)
INFO   | jvm 1    | 2007/03/01 14:37:53 |       at com.opensymphony.xwork.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:115)
INFO   | jvm 1    | 2007/03/01 14:37:53 |       at com.opensymphony.xwork.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:86)
INFO   | jvm 1    | 2007/03/01 14:37:53 |       at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:188)
INFO   | jvm 1    | 2007/03/01 14:37:53 |       at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:31)
INFO   | jvm 1    | 2007/03/01 14:37:53 |       at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:188)
INFO   | jvm 1    | 2007/03/01 14:37:53 |       at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:31)
INFO   | jvm 1    | 2007/03/01 14:37:53 |       at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:188)
INFO   | jvm 1    | 2007/03/01 14:37:53 |       at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:31)
INFO   | jvm 1    | 2007/03/01 14:37:53 |       at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:188)
INFO   | jvm 1    | 2007/03/01 14:37:53 |       at com.opensymphony.webwork.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:171)
INFO   | jvm 1    | 2007/03/01 14:37:53 |       at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:188)
INFO   | jvm 1    | 2007/03/01 14:37:53 |       at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:31)
Est il possible de supprimer ce group a la main ?