A continuación se muestra mi lógica de cifrado. Aunque mi IV tiene 16bytes de largo, sigo teniendo un error con una longitud IV no válida. Agradecería cualquier ayuda

@Override
public String encrypt(String dataToEncrypt, String IV) throws Exception{
    if(encryptionKey.length() < 10){
        encryptionKey = generateEncryptionKey().toString();
    }
    System.out.println("number of IV bytes is "+IV.length()+" "+IV);
    Cipher cipher = Cipher.getInstance(encrpytionAlgo);
    SecretKey key = new SecretKeySpec(encryptionKey.getBytes(Charset.forName("UTF-8")), "AES");
    cipher.init(Cipher.ENCRYPT_MODE, key,new IvParameterSpec(IV.getBytes(Charset.forName("UTF-8"))));
    byte[] encryptedTextBytes = cipher.doFinal(dataToEncrypt.getBytes(Charset.forName("UTF-8")));
    return new Base64().encodeAsString(encryptedTextBytes);
}

IV y lógica de generación de claves

 @Override
public String generateRandomIV(){
        Random random = new SecureRandom();
        byte[] iv = new byte[16];
        random.nextBytes(iv);
        System.out.println("IV is "+Base64.encodeBase64(iv)+" "+ com.sun.jersey.core.util.Base64.base64Decode(new String(Base64.encodeBase64(iv)))+ " number of bytes is "+iv.length);
        return new String(Base64.encodeBase64(iv));
}

@Override
public SecretKey generateEncryptionKey(){
    KeyGenerator aesKey = null;
    try {
        aesKey = KeyGenerator.getInstance("AES");
    } catch (NoSuchAlgorithmException e) {
          e.printStackTrace();
    }
    aesKey.init(256);
    SecretKey secretKey = aesKey.generateKey();
    System.out.println("Encryption key is "+ new Base64().encode(secretKey.getEncoded()));
    return secretKey;
}

A continuación se muestra el stacktrace para la excepción La excepción está en línea:
cipher.init (Cipher.ENCRYPT_MODE, clave, nuevo IvParameterSpec (IV.getBytes (Charset.forName ("UTF-8"))));

java.security.InvalidAlgorithmParameterException: Wrong IV length: must be 16 bytes long
at com.sun.crypto.provider.SunJCE_f.a(DashoA13*..)
at com.sun.crypto.provider.AESCipher.engineInit(DashoA13*..)
at javax.crypto.Cipher.a(DashoA13*..)
at javax.crypto.Cipher.a(DashoA13*..)
at javax.crypto.Cipher.init(DashoA13*..)
at javax.crypto.Cipher.init(DashoA13*..)
at com.intuit.platform.publiccloudaccess.core.services.EncryptionServiceImpl.encrypt(EncryptionServiceImpl.java:47)