Using RNCryptor to decrypt data throws "Decryption error: unknownHeader"

Question

I have used RNCryptor in my objective-c project to encrypt and decrypt a plist data file. Now I am recreating the project in Swift. When I try to decrypt the plist data in swift project which was created in objective-c project, it always throw "Decryption error: unknownHeader". I am using the same app identifier so that I can access the same plist file which was stored in App's Document's directory. Could someone advise what I am doing wrong? Here is my code:

Objective C - Encrypting and Saving to directory:

- (void)savePasswordlistItems {
    NSMutableData *data = [[NSMutableData alloc] init];
    NSKeyedArchiver *archiver = [[NSKeyedArchiver alloc] initForWritingWithMutableData:data];
    [archiver encodeObject:items forKey:@"MyKey"];
    [archiver finishEncoding];
   
    NSError *error;
    NSData *encryptedData = [RNEncryptor encryptData:data
                                        withSettings:kRNCryptorAES256Settings
                                            password:MY_SECRET_KEY
                                               error:&error];
    [encryptedData writeToFile:[self dataFilePath] atomically:YES];
    }

Objective C - Decrypting, decoding, adding to NSmutableArray:

- (void)loadPasswordlistItems {
    if ([[NSFileManager defaultManager] fileExistsAtPath:path])
    {
        NSData *data = [[NSData alloc] initWithContentsOfFile:path];
        
        NSError *error;
        NSData *decryptedData = [RNDecryptor decryptData:data
                                            withPassword:MY_SECRET_KEY
                                                   error:&error];

        NSKeyedUnarchiver *unarchiver = [[NSKeyedUnarchiver alloc] initForReadingWithData: decryptedData];
        items = [unarchiver decodeObjectForKey:@"MyKey"];
        [unarchiver finishDecoding];
    }
    else
    {
        items = [[NSMutableArray alloc] initWithCapacity:20];
    }
    
  
}

Swift - Decrypting, decoding and adding to NSMutableArray:

func loadPasswordlistItems() {
        let path = dataFilePath()
        if FileManager.default.fileExists(atPath: path) {
            do {
                let data = try Data(contentsOf: URL(fileURLWithPath: path))
                
                do {
                    let decryptedData = try RNCryptor.decrypt(data: data, withPassword: Constants.MY_SECRET_KEY)
                    let unarchiver = try NSKeyedUnarchiver(forReadingFrom: decryptedData)
                    items = (unarchiver.decodeObject(forKey: "MyKey") as! NSMutableArray)
                    unarchiver.finishDecoding()                    
                } catch {
                    // Handle decryption error
                    print("Decryption error: \(error)")
                }
            } catch {
                // Handle reading data from file error
                print("Error reading data from file: \(error)")
            }
        } else {
            items = []
        }
    }

Swift - Encoding, Encrypting and writing to Directory (I haven't test this as I could not decrypt the existing plist file):

func savePasswordlistItems() {
        let data = NSMutableData()
        let archiver = NSKeyedArchiver(forWritingWith: data)
        archiver.encode(items, forKey: "MyKey")
        archiver.finishEncoding()
                
        let encryptedFile = RNCryptor.encrypt(data: data as Data, withPassword: Constants.MY_SECRET_KEY)
        do {
            try encryptedFile.write(to: URL(fileURLWithPath: dataFilePath()), options: .atomic)
        } catch {
            print(error)
        }
    }