sentences:  Nickelodeon was a failure and continually lost money due to weak advertising sales and its inability to compete against its more successful rival, Der Kinderkanal.As a result, Nickelodeon closed on 31 May 1998.Nickelodeon soon thereafter struck a deal with RTL's owner the Compagnie Luxembourgeoise de Télédiffusion to broadcast their programming on RTL's own children's channel, Super RTL (which, ironically, was a joint venture between RTL and Disney) in addition to a weekend morning Nicktoons block on the main RTL channel.