Failing composer.json

composer.json

{
  "name": "ReStream Solutions API",
  "license": "proprietary",
  "type": "project",
  "autoload": {
    "psr-4": {
      "": "src/"
    },
    "classmap": [
      "app/AppKernel.php",
      "app/AppCache.php"
    ]
  },
  "autoload-dev": {
    "psr-4": {
      "Tests\\": "tests/"
    }
  },
  "require": {
    "php": ">=7.0.0",
    "symfony/symfony": "3.0.*",
    "doctrine/orm": "^2.5",
    "doctrine/doctrine-bundle": "^1.6",
    "doctrine/doctrine-cache-bundle": "^1.2",
    "doctrine/doctrine-migrations-bundle": "^1.0",
    "sensio/generator-bundle": "^3.0",
    "symfony/swiftmailer-bundle": "^2.3",
    "symfony/monolog-bundle": "^2.8",
    "sensio/distribution-bundle": "^5.0",
    "sensio/framework-extra-bundle": "^3.0.2",
    "incenteev/composer-parameter-handler": "^2.0",
    "chrisboulton/php-resque": "^1.2",
    "predis/predis": "^1.0",
    "doctrine/cache": "^1.6",
    "ramsey/uuid": "^3.4",
    "nelmio/api-doc-bundle": "^2.12",
    "symfony/assetic-bundle": "^2.8",
    "aws/aws-sdk-php": "^3.18",
    "guzzlehttp/guzzle": "^6.2",
    "symfony/serializer": "^3.0",
    "rollbar/rollbar": "^0.18.0",
    "ekino/newrelic-bundle": "^1.3",
    "phpunit/phpunit": "^5.3",
    "zendframework/zend-code": "3.0.2",
    "fresh/doctrine-enum-bundle": "~4.6",
    "ocramius/proxy-manager": "^2.0"
  },
  "require-dev": {
    "symfony/phpunit-bridge": "^3.0"
  },
  "scripts": {
    "post-install-cmd": [
      "Incenteev\\ParameterHandler\\ScriptHandler::buildParameters",
      "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::buildBootstrap",
      "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::clearCache",
      "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::installAssets",
      "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::installRequirementsFile",
      "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::prepareDeploymentTarget",
      "CoreBundle\\Composer\\UpdateVendor::migrate"
    ],
    "post-update-cmd": [
      "Incenteev\\ParameterHandler\\ScriptHandler::buildParameters",
      "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::buildBootstrap",
      "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::clearCache",
      "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::installAssets",
      "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::installRequirementsFile",
      "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::prepareDeploymentTarget",
      "CoreBundle\\Composer\\UpdateVendor::migrate"
    ]
  },
  "extra": {
    "symfony-app-dir": "app",
    "symfony-bin-dir": "bin",
    "symfony-var-dir": "var",
    "symfony-web-dir": "web",
    "symfony-tests-dir": "tests",
    "symfony-assets-install": "relative",
    "incenteev-parameters": {
      "file": "app/config/parameters.yml"
    }
  },
  "config": {
    "bin-dir": "bin",
    "vendor-dir": "/var/vendor"
  }
}