The present invention relates to a wireless communication system. More specifically, the present invention relates to a method and a device for a configuration error management for a sidelink radio bearer, the method comprising detecting configuration error for a sidelink radio bearer comprising a RLC entity and a PDCP entity, starting a timer when the configuration error for the sidelink radio bearer is detected, generating a configuration error recovery request including an identifier of the sidelink radio bearer, and transmitting the configuration error recovery request to a network or a peer UE directly connected to the UE via a sidelink.