var db = new NotentoolEntities();
    IQueryable<GroupOfBranches> queryGOB = db.tabGroupOfBranches.Cast<GroupOfBranches>().Where(x => x.intGroupID.Equals(ID));
    List<GroupOfBranches> GOB = new List<GroupOfBranches>(queryGOB); //here is the error

A first chance exception of type 'System.NotSupportedException' occurred in EntityFramework.SqlServer.dll