The objective of the method below is to delete the data from the database using entity framework. I am populating the subscriptions entity by passing two parameters and then calling the atttach and remove method of the context class. Bureau entities is the context class.

using (BUREAUEntities bureauEntities = new BUREAUEntities()) {

                var subscription = new SubcriptionRepository().GetSusbcriptionBySubscriptionTypeId(subscriptionTypeId, companyId);
                bureauEntities.Subscriptions.Attach((DataAccessLayer.DatabaseModel.Subscription)subscription);
                bureauEntities.Subscriptions.Remove(subscription);
                bureauEntities.SaveChanges();
            }

I am getting the following error message at An entity object cannot be referenced by multiple instances of IEntityChangeTracker at line

bureauEntities.Subscriptions.Attach((DataAccessLayer.DatabaseModel.Subscription)subscription);

Could somebody tell me where am I going wrong ?