error moving projects to a new group

javax.jdo.JDODetachedFieldAccessException: You have just attempted to access field "projects" yet this field was not detached when you detached the object. Either dont access this field, or detach the field when detaching the object.
at org.apache.maven.continuum.model.project.ProjectGroup.jdoGetprojects(ProjectGroup.java)
at org.apache.maven.continuum.model.project.ProjectGroup.getProjects(ProjectGroup.java:237)
at org.apache.maven.continuum.model.project.ProjectGroup.createProjectAssociation(ProjectGroup.java:141)
at org.apache.maven.continuum.model.project.Project.setProjectGroup(Project.java:818)
at org.apache.maven.continuum.web.action.ProjectGroupAction.save(ProjectGroupAction.java:316)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at com.opensymphony.xwork.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:364)
at com.opensymphony.xwork.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:216)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:190)
at com.opensymphony.xwork.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:168)
at com.opensymphony.xwork.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:86)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:188)
at com.opensymphony.xwork.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:115)
at com.opensymphony.xwork.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:86)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:188)
at org.apache.maven.continuum.web.interceptor.ForceContinuumConfigurationInterceptor.intercept(ForceContinuumConfigurationInterceptor.java:73)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:188)
at org.codehaus.plexus.redback.xwork.interceptor.PolicyEnforcementInterceptor.intercept(PolicyEnforcementInterceptor.java:103)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:188)
at org.codehaus.plexus.redback.xwork.interceptor.SecureActionInterceptor.intercept(SecureActionInterceptor.java:178)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:188)
at org.codehaus.plexus.xwork.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:58)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:188)
at com.opensymphony.xwork.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:168)
at com.opensymphony.xwork.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:86)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:188)
at com.opensymphony.xwork.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:115)
at com.opensymphony.xwork.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:86)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:188)
at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:31)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:188)
at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:31)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:188)
at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:31)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:188)
at com.opensymphony.webwork.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:171)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:188)
at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:31)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:188)
at com.opensymphony.webwork.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:147)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:188)
at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:31)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:188)
at com.opensymphony.xwork.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:151)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:188)
at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:31)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:188)
at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:31)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:188)
at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:31)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:188)
at com.opensymphony.xwork.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:186)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:188)
at org.codehaus.plexus.redback.xwork.interceptor.AutoLoginInterceptor.intercept(AutoLoginInterceptor.java:156)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:188)
at org.codehaus.plexus.redback.xwork.interceptor.ForceAdminUserInterceptor.intercept(ForceAdminUserInterceptor.java:63)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:188)
at org.codehaus.plexus.redback.xwork.interceptor.EnvironmentCheckInterceptor.intercept(EnvironmentCheckInterceptor.java:122)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:188)
at com.opensymphony.xwork.DefaultActionProxy.execute(DefaultActionProxy.java:113)
at com.opensymphony.webwork.dispatcher.DispatcherUtils.serviceAction(DispatcherUtils.java:225)
at com.opensymphony.webwork.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:202)
at org.mortbay.jetty.servlet.WebApplicationHandler$CachedChain.doFilter(WebApplicationHandler.java:821)
at com.opensymphony.module.sitemesh.filter.PageFilter.parsePage(PageFilter.java:118)
at com.opensymphony.module.sitemesh.filter.PageFilter.doFilter(PageFilter.java:52)
at org.mortbay.jetty.servlet.WebApplicationHandler$CachedChain.doFilter(WebApplicationHandler.java:821)
at com.opensymphony.webwork.dispatcher.ActionContextCleanUp.doFilter(ActionContextCleanUp.java:88)
at org.mortbay.jetty.servlet.WebApplicationHandler$CachedChain.doFilter(WebApplicationHandler.java:821)
at org.mortbay.jetty.servlet.WebApplicationHandler.dispatch(WebApplicationHandler.java:471)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:568)
at org.mortbay.http.HttpContext.handle(HttpContext.java:1530)
at org.mortbay.jetty.servlet.WebApplicationContext.handle(WebApplicationContext.java:633)
at org.mortbay.http.HttpContext.handle(HttpContext.java:1482)
at org.mortbay.http.HttpServer.service(HttpServer.java:909)
at org.mortbay.http.HttpConnection.service(HttpConnection.java:816)
at org.mortbay.http.HttpConnection.handleNext(HttpConnection.java:982)
at org.mortbay.http.HttpConnection.handle(HttpConnection.java:833)
at org.mortbay.http.SocketListener.handleConnection(SocketListener.java:244)
at org.mortbay.util.ThreadedServer.handle(ThreadedServer.java:357)
at org.mortbay.util.ThreadPool$PoolThread.run(ThreadPool.java:534)