I am getting error log that "Create Room operation failed with code: -39"

I use playfab and photon bolt integration. It was working fine and suddenly stopped working. I am getting this line from the log "Create Room operation failed with code: -39". Also, the bolt session creation fails with error reason "OK". Also, inside BoltStartDone, SessionId from PlayFabMultiplayerAgentAPI is empty. I have attached the log here. What is the meaning of code "-39" and how to resolve this issue. Thanks in advance.