Device Authentication is always Invalid

[koptan]

if I try to run simulated_device_and_reader_interaction test case I am always getting the following response :

Validated Response: ResponseAuthenticationOutcome { response: {"org.iso.18013.5.1": Object {"age_over_21": Bool(true)}}, issuer_authentication: Invalid, **device_authentication: Invalid**, errors: {"certificate_errors": Array [String("DS certificate error: expired"), String("DS certificate error: SubjectKeyIdentifier: required extension not found"), String("DS certificate error: ExtendedKeyUsage: required extension not found"), String("DS certificate error: KeyUsage: required extension not found"), String("DS certificate error: CrlDistributionPoints: required extension not found"), String("DS certificate error: IssuerAlternativeName: required extension not found"), String("IACA certificate error: no valid trust anchor found")], "device_authentication_errors": Array [String("Failed mdoc authentication: failed verifying device signature: signature is not authentic: signature error")]} }

Why device_authentication is Invalid and not able to verify the signature?