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
}
}
}