KeystoreV3.swift An error occurred .error missage: 'Type of expression is ambiguous without more context'

[Ann-iOS]

private func encryptData(password: String, salt: Data, length: Int, N: Int, R: Int, P: Int) -> Data? { guard let passwordData = password.data(using: .utf8)?.sha3(.keccak256) else {return nil} guard let deriver = try? Scrypt(password: [UInt8](passwordData), salt: [UInt8](salt), dkLen: length, N: N, r: R, p: P) else {return nil} guard let result = try? deriver.calculate() else {return nil} return Data(result) }
This method prompts an error: Type of expression is ambiguous without more context