title: Key autoload is a duplicate in ./composer.json at line 20
body: <p>I have errors when i did composer update</p>
  
  <p>this is is composer.json   </p>
  
  <pre><code> {
          "name": "trigui/symfony",
          "license": "proprietary",
          "type": "project",
          "autoload": {
              "psr-4": {
                  "": "src/"
              },
              "classmap": [
                  "app/AppKernel.php",
                  "app/AppCache.php"
              ]
          },
        "autoload": {
          "psr-4": {
            "": "src/",
            "VotreNamespace": "chemin/vers/la/bibliotheque"
          },
          "files": [ "app/AppKernel.php" ]
        },    
          "autoload-dev": {
              "psr-4": {
                  "Tests\\": "tests/"
              },
              "files": [
                  "vendor/symfony/symfony/src/Symfony/Component/VarDumper/Resources/functions/dump.php"
              ]
          },
          "require": {
              "php": "&gt;=5.5.9",
              "doctrine/doctrine-bundle": "^1.6",
              "doctrine/orm": "^2.5",
              "incenteev/composer-parameter-handler": "^2.0",
              "sensio/distribution-bundle": "^5.0.19",
              "sensio/framework-extra-bundle": "^3.0.2",
              "symfony/monolog-bundle": "^3.1.0",
              "symfony/polyfill-apcu": "^1.0",
              "symfony/swiftmailer-bundle": "^2.3.10",
              "symfony/symfony": "3.3.*",
              "twig/twig": "^1.0||^2.0",
              "doctrine/doctrine-fixtures-bundle":"~2.3"
          },
          "require-dev": {
              "sensio/generator-bundle": "^3.0",
              "symfony/phpunit-bridge": "^3.0"
          },
              "branch-alias": null
          }
      }
  </code></pre>
  
  <p>and this the errors : </p>
  
  <blockquote>
    <p>Key autoload is a duplicate in ./composer.json at line 20</p>
  </blockquote>
  
  <hr>
  
  <blockquote>
    <p>A non-empty PSR-4 prefix must end with a namespace separator.</p>
  </blockquote>
  
  <p>Please what is the probleme ? </p>