RSA Encryption And Decryption . Getting Error When I Convert Encryption To Decryption

 public final String modulusString = "2rRVVVFJRbH/wAPDtnwZwu+nxU+AZ6uXxh/sW+AMCBogg7vndZsnRiHoLttYYPqOyOhfgaBOQogrIfrKL4lipK4m52SBzw/FfcM9DsKs/rYR83tBLiIAfgdnVjF27tZID+HJMFTiI30mALjr7+tfp+2lIACXA1RIKTk7S9pDmX8=";
   public final String publicExponentString = "AQAB";
  
Encryption Code :

 public String EncryptionValue(String EncryptionValue) throws Base64DecodingException, NoSuchAlgorithmException, InvalidKeySpecException, NoSuchPaddingException, InvalidKeyException, IllegalBlockSizeException, UnsupportedEncodingException, BadPaddingException
    {

        byte[] modulebytes = Base64.decode(modulusString);
        byte[] exponentbytes = Base64.decode(publicExponentString);
       
        BigInteger module = new BigInteger(1,modulebytes);
        BigInteger publicexponent = new BigInteger(1,exponentbytes);
        
            RSAPublicKeySpec rsaPubKey = new RSAPublicKeySpec(module, publicexponent);
        KeyFactory fact = KeyFactory.getInstance("RSA");
        PublicKey pubKey = fact.generatePublic(rsaPubKey);

        Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
        cipher.init(Cipher.ENCRYPT_MODE, pubKey);

        byte[] plainBytes = EncryptionValue.getBytes("UTF-8");
        byte[] cipherData = cipher.doFinal( plainBytes );
        String encryptedString = Base64.encode(cipherData);
        
        return encryptedString;
    }


Decryption Code :


  public String DecryptionValue(String DecryptionValue) throws Base64DecodingException, NoSuchAlgorithmException, InvalidKeySpecException, NoSuchPaddingException, InvalidKeyException, UnsupportedEncodingException, IllegalBlockSizeException, BadPaddingException
    {
        byte[] modulebytes = Base64.decode(modulusString);
        byte[] exponentbytes = Base64.decode(publicExponentString);
        
        BigInteger modulus = new BigInteger(1, modulebytes );
        BigInteger exponent = new BigInteger(1, exponentbytes);

        RSAPrivateKeySpec rsaPrivKey = new RSAPrivateKeySpec(modulus, exponent);
        KeyFactory fact = KeyFactory.getInstance("RSA");
        PrivateKey privKey = fact.generatePrivate(rsaPrivKey);

        Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
        cipher.init(Cipher.DECRYPT_MODE, privKey);

        byte[] base64String = Base64.decode(DecryptionValue);
        byte[] plainBytes = new String(base64String).getBytes("UTF-8");
        plainBytes = cipher.update(plainBytes);
        byte[] values = cipher.doFinal(plainBytes);

        return new String(values, "UTF-8");
    }

Exception in thread "main" javax.crypto.BadPaddingException: Decryption error
	at sun.security.rsa.RSAPadding.unpadV15(RSAPadding.java:380)
	at sun.security.rsa.RSAPadding.unpad(RSAPadding.java:291)
	at com.sun.crypto.provider.RSACipher.doFinal(RSACipher.java:363)
	at com.sun.crypto.provider.RSACipher.engineDoFinal(RSACipher.java:389)
	at javax.crypto.Cipher.doFinal(Cipher.java:2121)
	at cryptocodefinal.CryptoCodeFinal.DecryptionValue(CryptoCodeFinal.java:79)
	at cryptocodefinal.CryptoCodeFinal.main(CryptoCodeFinal.java:148)