NS_ERROR_ENUM(FIRAppCheckErrorDomain,FIRAppCheckErrorCode){/// An unknown or non-actionable error.FIRAppCheckErrorCodeUnknown=0,/// A network connection error.FIRAppCheckErrorCodeServerUnreachable=1,/// Invalid configuration error. Currently, an exception is thrown but this error is reserved/// for future implementations of invalid configuration detection.FIRAppCheckErrorCodeInvalidConfiguration=2,/// System keychain access error. Ensure that the app has proper keychain access.FIRAppCheckErrorCodeKeychain=3,/// Selected app attestation provider is not supported on the current platform or OS version.FIRAppCheckErrorCodeUnsupported=4}