Compile Error: Exception because the name is already in use

[KotetsuNoAkai]

when i tried to make a pay in palpay express or offline, i have this error:

Compile Error: Cannot use League\Uri\Components\Exception as Exception because the name is already in use.

in vendor\league\uri-components\src\QueryParser.php (line 20)

declare(strict_types=1);
namespace League\Uri;
use League\Uri\Components\EncodingInterface;
use League\Uri\Components\Exception;
use Traversable;
use TypeError;

My code:

public function processPaymentAction(Bookings $booking) { $storage = $this->get('payum')->getStorage(Payment::class);

    $payment = $storage->create();
    $payment->setNumber($booking->getUniq());
    $payment->setCurrencyCode('EUR');
    $payment->setTotalAmount($booking->getFinalPrice()*100);
    $payment->setClientId($booking->getEmail());
    $payment->setClientEmail($booking->getEmail());
    $storage->update($payment);
    $captureToken = $this->get('payum')->getTokenFactory()->createCaptureToken('offline', $payment, 'finishBuyCard');

    return $this->redirect($captureToken->getTargetUrl());
} 

My composer.json: { "type": "project", "license": "proprietary", "require": { "php": "^7.0.8", "ext-iconv": "", "easycorp/easyadmin-bundle": "^1.17", "egeloen/ckeditor-bundle": "^6.0", "league/uri-components": "@dev", "payum/paypal-express-checkout-nvp": "^1.4", "payum/offline": "^1.5", "payum/payum-bundle": "^2.2", "php-http/guzzle6-adapter": "^1.1", "sensio/framework-extra-bundle": "^5.1", "stof/doctrine-extensions-bundle": "^1.3", "symfony/apache-pack": "^1.0", "symfony/asset": "^3.4", "symfony/console": "^3.4", "symfony/debug-pack": "", "symfony/expression-language": "^3.4", "symfony/flex": "^1.0", "symfony/form": "^3.4", "symfony/framework-bundle": "^3.4", "symfony/lts": "^3", "symfony/monolog-bundle": "^3.1", "symfony/orm-pack": "", "symfony/process": "^3.4", "symfony/security-bundle": "^3.4", "symfony/serializer-pack": "", "symfony/swiftmailer-bundle": "^3.1", "symfony/validator": "^3.4", "symfony/web-link": "^3.4", "symfony/webpack-encore-pack": "", "symfony/yaml": "^3.4" }, "require-dev": { "doctrine/doctrine-fixtures-bundle": "^3.0", "symfony/browser-kit": "^3.4", "symfony/css-selector": "^3.4", "symfony/dotenv": "^3.4", "symfony/maker-bundle": "^1.0", "symfony/phpunit-bridge": "^3.4", "symfony/profiler-pack": "" }, "config": { "preferred-install": { "": "dist" }, "sort-packages": true }, "autoload": { "psr-4": { "App\": "src/" } }, "autoload-dev": { "psr-4": { "App\Tests\": "tests/" } }, "replace": { "symfony/polyfill-iconv": "", "symfony/polyfill-php70": "", "symfony/polyfill-php56": "" }, "scripts": { "auto-scripts": { "cache:clear": "symfony-cmd", "assets:install --symlink --relative %PUBLIC_DIR%": "symfony-cmd" }, "post-install-cmd": [ "@auto-scripts" ], "post-update-cmd": [ "@auto-scripts" ] }, "conflict": { "symfony/symfony": "*" }, "extra": { "symfony": { "id": "01C80JWP1A032K4AM6DMBNNC57", "allow-contrib": false } } }