title: How to fix laravel composer update issue ( Illuminate\Foundation\ComposerScripts::postAutoloadDump failed to open stream: No such file or directory)
body: <p>I'm currently working on a laravel project using an existing package for e-commerce functionality called Bagisto. I already downloaded the package files from the repository on <a href="https://github.com/bagisto/bagisto" rel="nofollow noreferrer">GitHub</a> and dopped the files inside xampp htdocs folder on my Ubuntu 18.04 OS.
  The problem happens after I launch <code>composer update</code> in the terminal inside my project directory I get this error message:</p>
  
  <pre><code>Loading composer repositories with package information
  Updating dependencies (including require-dev)
  Nothing to install or update
  Generating optimized autoload files
  &gt; Illuminate\Foundation\ComposerScripts::postAutoloadDump
  PHP Warning:  Uncaught ErrorException: require(/opt/lampp/htdocs/bagisto/vendor/composer/../guzzlehttp/guzzle/src/functions_include.php): failed to open stream: No such file or directory in /opt/lampp/htdocs/bagisto/vendor/composer/autoload_real.php:66
  Stack trace:
  #0 /opt/lampp/htdocs/bagisto/vendor/composer/autoload_real.php(66): Composer\Util\ErrorHandler::handle(2, 'require(/opt/la...', '/opt/lampp/htdo...', 66, Array)
  #1 /opt/lampp/htdocs/bagisto/vendor/composer/autoload_real.php(66): require()
  #2 /opt/lampp/htdocs/bagisto/vendor/composer/autoload_real.php(56): composerRequire75e2944913aa928a280073a462abdd28('37a3dc5111fe8f7...', '/opt/lampp/htdo...')
  #3 /opt/lampp/htdocs/bagisto/vendor/autoload.php(7): ComposerAutoloaderInit75e2944913aa928a280073a462abdd28::getLoader()
  #4 /opt/lampp/htdocs/bagisto/vendor/laravel/framework/src/Illuminate/Foundation/ComposerScripts.php(43): require_once('/opt/lampp/htdo...')
  #5 phar:///usr/local/bin/composer/src/Composer/EventDispatcher/EventDispatcher.php(297): Illuminate\Foundation\C in /opt/lampp/htdocs/bagisto/vendor/composer/autoload_real.php on line 66
  
  Warning: Uncaught ErrorException: require(/opt/lampp/htdocs/bagisto/vendor/composer/../guzzlehttp/guzzle/src/functions_include.php): failed to open stream: No such file or directory in /opt/lampp/htdocs/bagisto/vendor/composer/autoload_real.php:66
  Stack trace:
  #0 /opt/lampp/htdocs/bagisto/vendor/composer/autoload_real.php(66): Composer\Util\ErrorHandler::handle(2, 'require(/opt/la...', '/opt/lampp/htdo...', 66, Array)
  #1 /opt/lampp/htdocs/bagisto/vendor/composer/autoload_real.php(66): require()
  #2 /opt/lampp/htdocs/bagisto/vendor/composer/autoload_real.php(56): composerRequire75e2944913aa928a280073a462abdd28('37a3dc5111fe8f7...', '/opt/lampp/htdo...')
  #3 /opt/lampp/htdocs/bagisto/vendor/autoload.php(7): ComposerAutoloaderInit75e2944913aa928a280073a462abdd28::getLoader()
  #4 /opt/lampp/htdocs/bagisto/vendor/laravel/framework/src/Illuminate/Foundation/ComposerScripts.php(43): require_once('/opt/lampp/htdo...')
  #5 phar:///usr/local/bin/composer/src/Composer/EventDispatcher/EventDispatcher.php(297): Illuminate\Foundation\C in /opt/lampp/htdocs/bagisto/vendor/composer/autoload_real.php on line 66
  PHP Fatal error:  composerRequire75e2944913aa928a280073a462abdd28(): Failed opening required '/opt/lampp/htdocs/bagisto/vendor/composer/../guzzlehttp/guzzle/src/functions_include.php' (include_path='.:/usr/share/php') in /opt/lampp/htdocs/bagisto/vendor/composer/autoload_real.php on line 66
  
  Fatal error: composerRequire75e2944913aa928a280073a462abdd28(): Failed opening required '/opt/lampp/htdocs/bagisto/vendor/composer/../guzzlehttp/guzzle/src/functions_include.php' (include_path='.:/usr/share/php') in /opt/lampp/htdocs/bagisto/vendor/composer/autoload_real.php on line 66
  </code></pre>
  
  <p>And the composer.json file content is:</p>
  
  <pre><code>{
      "name": "bagisto/bagisto",
      "description": "Bagisto Laravel ECommerce",
      "keywords": [
          "framework",
          "laravel"
      ],
      "license": "MIT",
      "type": "project",
      "require": {
          "php": "^7.1.3",
          "barryvdh/laravel-dompdf": "^0.8.0@dev",
          "dimsav/laravel-translatable": "^9.0",
          "doctrine/dbal": "^2.9@dev",
          "fideloper/proxy": "^4.0",
          "flynsarmy/db-blade-compiler": "*",
          "intervention/image": "^2.4",
          "intervention/imagecache": "^2.3",
          "kalnoy/nestedset": "^4.3",
          "konekt/concord": "^1.2",
          "laravel/framework": "5.7.*",
          "laravel/tinker": "^1.0",
          "maatwebsite/excel": "3.1.x-dev",
          "nwidart/laravel-modules": "^3.2",
          "prettus/l5-repository": "^2.6",
          "propaganistas/laravel-intl": "^2.0"
      },
      "require-dev": {
          "barryvdh/laravel-debugbar": "^3.1",
          "filp/whoops": "^2.0",
          "fzaninotto/faker": "^1.4",
          "mockery/mockery": "^1.0",
          "nunomaduro/collision": "^2.0",
          "phpro/grumphp": "dev-master",
          "phpunit/phpunit": "^7.0"
      },
      "replace": {
          "bagisto/laravel-user": "v0.1.0",
          "bagisto/laravel-admin": "v0.1.0",
          "bagisto/laravel-ui": "v0.1.0",
          "bagisto/laravel-core": "v0.1.0",
          "bagisto/laravel-attribute": "v0.1.0",
          "bagisto/laravel-checkout": "v0.1.0",
          "bagisto/laravel-customer": "v0.1.0",
          "bagisto/laravel-inventory": "v0.1.0",
          "bagisto/laravel-category": "v0.1.0",
          "bagisto/laravel-product": "v0.1.0",
          "bagisto/laravel-shop": "v0.1.0",
          "bagisto/laravel-theme": "v0.1.0",
          "bagisto/laravel-shipping": "v0.1.0",
          "bagisto/laravel-payment": "v0.1.0",
          "bagisto/laravel-sales": "v0.1.0",
          "bagisto/laravel-tax": "v0.1.0"
      },
      "autoload": {
          "classmap": [
              "database/seeds",
              "database/factories"
          ],
          "psr-4": {
              "App\\": "app/",
              "Webkul\\User\\": "packages/Webkul/User/src",
              "Webkul\\Admin\\": "packages/Webkul/Admin/src",
              "Webkul\\Ui\\": "packages/Webkul/Ui/src",
              "Webkul\\Category\\": "packages/Webkul/Category/src",
              "Webkul\\Checkout\\": "packages/Webkul/Checkout/src",
              "Webkul\\Attribute\\": "packages/Webkul/Attribute/src",
              "Webkul\\Shop\\": "packages/Webkul/Shop/src",
              "Webkul\\Core\\": "packages/Webkul/Core/src",
              "Webkul\\Customer\\": "packages/Webkul/Customer/src",
              "Webkul\\Inventory\\": "packages/Webkul/Inventory/src",
              "Webkul\\Product\\": "packages/Webkul/Product/src",
              "Webkul\\Theme\\": "packages/Webkul/Theme/src",
              "Webkul\\Shipping\\": "packages/Webkul/Shipping/src",
              "Webkul\\Payment\\": "packages/Webkul/Payment/src",
              "Webkul\\Paypal\\": "packages/Webkul/Paypal/src",
              "Webkul\\Sales\\": "packages/Webkul/Sales/src",
              "Webkul\\Tax\\": "packages/Webkul/Tax/src",
              "Webkul\\API\\": "packages/Webkul/API"
          }
      },
      "autoload-dev": {
          "psr-4": {
              "Tests\\": "tests/"
          }
      },
      "extra": {
          "laravel": {
              "dont-discover": []
          }
      },
      "repositories": [
          {
              "type": "composer",
              "url": "https://packagist.org"
          },
          {
              "packagist": false
          }
      ],
      "scripts": {
          "post-root-package-install": [
              "@php -r \"file_exists('.env') || copy('.env.example', '.env');\""
          ],
          "post-create-project-cmd": [
              "@php artisan key:generate"
          ],
          "post-autoload-dump": [
              "Illuminate\\Foundation\\ComposerScripts::postAutoloadDump",
              "App\\Test::test",
              "@php artisan package:discover"
          ]
      },
      "config": {
          "preferred-install": "stable",
          "sort-packages": true,
          "optimize-autoloader": true
      },
      "minimum-stability": "dev"
  }
  
  </code></pre>
  
  <p>I already tried some ways to resolve this problem like updating the composer and the laravel framework version but still not getting any solution.</p>