What does this error mean, HAPErrorDomain Code = 3

 

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error: related decl 'e' for HMErrorCode(_nsError: Error Domain=HMErrorDomain Code=18 "Pairing Failed" UserInfo={NSLocalizedDescription=Pairing Failed, NSUnderlyingError=0x281503cc0 {Error Domain=HAPErrorDomain Code=3 "(null)"}})