RS when deleting an appointment with a BBB meeting

					<dispatchinfo>
	<componentinfo>
		<compname>ffo_main_null</compname>
		<compclass>org.olat.core.gui.components.form.flexible.impl.FormWrapperContainer</compclass>
		<extendedinfo>n/a</extendedinfo>
		<event>
			<class&amp;amp;gt;org.olat.core.gui.control.Event</class&amp;amp;gt;
			<command>validation ok</command>
			<tostring>com:validation ok,org.olat.core.gui.control.Event@d62b3f02</tostring>
		</event>
	</componentinfo>
	<controllerinfo>
		<controllername>org.olat.modules.appointments.ui.AppointmentDeleteController</controllername>
		<controllername>org.olat.modules.appointments.ui.AppointmentListEditController</controllername>
		<controllername>org.olat.modules.appointments.ui.TopicsRunCoachController</controllername>
		<controllername>org.olat.course.run.RunMainController</controllername>
		<controllername>org.olat.course.run.CourseRuntimeController</controllername>
		<controllername>org.olat.core.commons.fullWebApp.BaseFullWebappController</controllername>
	</controllerinfo>
</dispatchinfo>
					
Throwable: java.lang.IllegalArgumentException

message:Unknown
 entity: 
org.olat.modules.bigbluebutton.model.BigBlueButtonMeetingImpl$HibernateProxy$VmbZIrx7,java.lang.IllegalArgumentException

at org.hibernate.internal.SessionImpl.fireDelete(SessionImpl.java:910)
at org.hibernate.internal.SessionImpl.delete(SessionImpl.java:836)
at org.hibernate.internal.SessionImpl.remove(SessionImpl.java:3271)
at org.olat.modules.bigbluebutton.manager.BigBlueButtonMeetingDAO.deleteMeeting(BigBlueButtonMeetingDAO.java:218)
at org.olat.modules.bigbluebutton.manager.BigBlueButtonManagerImpl.deleteMeeting(BigBlueButtonManagerImpl.java:464)
at org.olat.modules.appointments.manager.AppointmentsServiceImpl.deleteMeeting(AppointmentsServiceImpl.java:773)
at org.olat.modules.appointments.manager.AppointmentsServiceImpl.deleteAppointment(AppointmentsServiceImpl.java:492)
at org.olat.modules.appointments.ui.AppointmentDeleteController.onAfterRemoving(AppointmentDeleteController.java:72)
at org.olat.modules.appointments.ui.AbstractParticipationRemoveController.formOK(AbstractParticipationRemoveController.java:305)
at org.olat.core.gui.components.form.flexible.impl.FormBasicController.event(FormBasicController.java:390)

1. cause:

message:Unknown
 entity: 
org.olat.modules.bigbluebutton.model.BigBlueButtonMeetingImpl$HibernateProxy$VmbZIrx7,org.hibernate.MappingException

at org.hibernate.metamodel.internal.MetamodelImpl.entityPersister(MetamodelImpl.java:704)
at org.hibernate.internal.SessionImpl.getEntityPersister(SessionImpl.java:1608)
at org.hibernate.event.internal.DefaultDeleteEventListener.disallowDeletionOfDetached(DefaultDeleteEventListener.java:187)
at
 
org.hibernate.event.internal.DefaultDeleteEventListener.performDetachedEntityDeletionCheck(DefaultDeleteEventListener.java:178)
at org.hibernate.event.internal.DefaultDeleteEventListener.onDelete(DefaultDeleteEventListener.java:105)
at org.hibernate.event.internal.DefaultDeleteEventListener.onDelete(DefaultDeleteEventListener.java:72)
at org.hibernate.event.service.internal.EventListenerGroupImpl.fireEventOnEachListener(EventListenerGroupImpl.java:102)
at org.hibernate.internal.SessionImpl.fireDelete(SessionImpl.java:904)
at org.hibernate.internal.SessionImpl.delete(SessionImpl.java:836)
at org.hibernate.internal.SessionImpl.remove(SessionImpl.java:3271)