herokuのデプロイ時にエラーが発生する（Class 'Barryvdh\Debugbar\ServiceProvider' not found）

Question

herokuへのデプロイ時に下記のようなエラーが発生し、デプロイが出来ない状態です。
対策が全く分からず、どのようなアプローチをすべきかご教示頂けないでしょうか。
よろしくお願いいたします。
composer updateをした後にデプロイする、という方法のみ思いついた為やりましたが、エラー内容は変わりませんでした。

//composer.json
    "require": {
        "php": ">=7.1.3",
        "doctrine/dbal": "^2.6",
        "encore/laravel-admin": "^1.5",
        "fideloper/proxy": "~4.0",
        "intervention/image": "^2.4",
        "jenssegers/agent": "^2.6",
        "laravel/framework": "5.6.*",
        "laravel/passport": "^5.0",
        "laravel/socialite": "^3.0",
        "laravel/tinker": "~1.0",
        "league/flysystem-aws-s3-v3": "^1.0"
    },
    "require-dev": {
        "barryvdh/laravel-debugbar": "^3.2",
        "filp/whoops": "~2.0",
        "fzaninotto/faker": "~1.4",
        "mockery/mockery": "~1.0",
        "nunomaduro/collision": "~1.1",
        "phpunit/phpunit": "~7.0",
        "symfony/thanks": "^1.0"
    },

-----> PHP app detected
-----> Bootstrapping...
-----> Installing platform packages...
       - php (7.2.11)
       - ext-mbstring (bundled with php)
       - nginx (1.8.1)
       - apache (2.4.34)
-----> Installing dependencies...
       Composer version 1.7.2 2018-08-16 16:57:12
       Loading composer repositories with package information
       Installing dependencies from lock file
       Package operations: 65 installs, 0 updates, 0 removals
         - Installing doctrine/cache (v1.8.0): Downloading (100%)
         - Installing doctrine/event-manager (v1.0.0): Downloading (100%)
         - Installing doctrine/inflector (v1.3.0): Downloading (100%)
         - Installing doctrine/lexer (v1.0.1): Downloading (100%)
         - Installing dragonmantank/cron-expression (v2.2.0): Downloading (100%)
         - Installing symfony/polyfill-mbstring (v1.9.0): Downloading (100%)
         - Installing symfony/polyfill-ctype (v1.9.0): Downloading (100%)
         - Installing symfony/dom-crawler (v4.1.6): Downloading (100%)
         - Installing vlucas/phpdotenv (v2.5.1): Downloading (100%)
         - Installing symfony/css-selector (v4.1.6): Downloading (100%)
         - Installing tijsverkoyen/css-to-inline-styles (2.2.1): Downloading (100%)
         - Installing symfony/polyfill-php72 (v1.9.0): Downloading (100%)
         - Installing symfony/var-dumper (v4.1.6): Downloading (100%)
         - Installing symfony/routing (v4.1.6): Downloading (100%)
         - Installing symfony/process (v4.1.6): Downloading (100%)
         - Installing symfony/http-foundation (v4.1.6): Downloading (100%)
         - Installing symfony/event-dispatcher (v4.1.6): Downloading (100%)
         - Installing psr/log (1.0.2): Downloading (100%)
         - Installing symfony/debug (v4.1.6): Downloading (100%)
         - Installing symfony/http-kernel (v4.1.6): Downloading (100%)
         - Installing symfony/finder (v4.1.6): Downloading (100%)
         - Installing symfony/console (v4.1.6): Downloading (100%)
         - Installing egulias/email-validator (2.1.6): Downloading (100%)
         - Installing swiftmailer/swiftmailer (v6.1.3): Downloading (100%)
         - Installing paragonie/random_compat (v2.0.17): Downloading (100%)
         - Installing ramsey/uuid (3.8.0): Downloading (100%)
         - Installing psr/simple-cache (1.0.1): Downloading (100%)
         - Installing psr/container (1.0.0): Downloading (100%)
         - Installing symfony/translation (v4.1.6): Downloading (100%)
         - Installing nesbot/carbon (1.25.0): Downloading (100%)
         - Installing monolog/monolog (1.23.0): Downloading (100%)
         - Installing league/flysystem (1.0.47): Downloading (100%)
         - Installing erusev/parsedown (1.7.1): Downloading (100%)
         - Installing laravel/framework (v5.6.39): Downloading (100%)
         - Installing doctrine/dbal (v2.8.0): Downloading (100%)
         - Installing encore/laravel-admin (v1.6.3): Downloading (100%)         
         - Installing fideloper/proxy (4.0.0): Downloading (100%)
         - Installing guzzlehttp/promises (v1.3.1): Downloading (100%)
         - Installing psr/http-message (1.0.1): Downloading (100%)
         - Installing guzzlehttp/psr7 (1.4.2): Downloading (100%)
         - Installing intervention/image (2.4.2): Downloading (100%)
         - Installing jakub-onderka/php-console-color (v0.2): Downloading (100%)
         - Installing mobiledetect/mobiledetectlib (2.8.33): Downloading (100%)
         - Installing jaybizzle/crawler-detect (v1.2.69): Downloading (100%)         
         - Installing jenssegers/agent (v2.6.0): Downloading (100%)
         - Installing zendframework/zend-diactoros (1.8.6): Downloading (100%)
         - Installing symfony/psr-http-message-bridge (v1.1.0): Downloading (100%)
         - Installing phpseclib/phpseclib (2.0.11): Downloading (100%)
         - Installing league/event (2.1.2): Downloading (100%)
         - Installing lcobucci/jwt (3.2.4): Downloading (100%)
         - Installing defuse/php-encryption (v2.2.1): Downloading (100%)
         - Installing league/oauth2-server (6.1.1): Downloading (100%)
         - Installing guzzlehttp/guzzle (6.3.3): Downloading (100%)
         - Installing firebase/php-jwt (v5.0.0): Downloading (100%)
         - Installing laravel/passport (v5.0.3): Downloading (100%)
         - Installing league/oauth1-client (1.7.0): Downloading (100%)
         - Installing laravel/socialite (v3.1.1): Downloading (100%)
         - Installing nikic/php-parser (v4.1.0): Downloading (100%)
         - Installing jakub-onderka/php-console-highlighter (v0.3.2): Downloading (100%)
         - Installing dnoegel/php-xdg-base-dir (0.1): Downloading (100%)
         - Installing psy/psysh (v0.9.8): Downloading (100%)
         - Installing laravel/tinker (v1.0.7): Downloading (100%)
         - Installing mtdowling/jmespath.php (2.4.0): Downloading (100%)
         - Installing aws/aws-sdk-php (3.69.3): Downloading (100%)
         - Installing league/flysystem-aws-s3-v3 (1.0.21): Downloading (100%)
       Generating optimized autoload files
       > Illuminate\Foundation\ComposerScripts::postAutoloadDump
       > @php artisan package:discover
       
       In ProviderRepository.php line 208:
                                                              
         Class 'Barryvdh\Debugbar\ServiceProvider' not found  
                                                              
       
       Script @php artisan package:discover handling the post-autoload-dump event returned with error code 1
 !     WARNING: There was a class not found error in your code
 !     ERROR: Dependency installation failed!
 !     
 !     The 'composer install' process failed with an error. The cause
 !     may be the download or installation of packages, or a pre- or
 !     post-install hook (e.g. a 'post-install-cmd' item in 'scripts')
 !     in your 'composer.json'.
 !     
 !     Typical error cases are out-of-date or missing parts of code,
 !     timeouts when making external connections, or memory limits.
 !     
 !     Check the above error output closely to determine the cause of
 !     the problem, ensure the code you're pushing is functioning
 !     properly, and that all local changes are committed correctly.
 !     
 !     For more information on builds for PHP on Heroku, refer to
 !     https://devcenter.heroku.com/articles/php-support
 !     Push rejected, failed to compile PHP app.
 !     Push failed

Comments

[xenbeat]

config/app.phpに登録しちゃってる感じでしょうか？config/app.phpの内容を質問文に追記ください。https://github.com/laravel/laravel/blob/master/config/app.php#L135

[supermaruetsu]

config/appには追加しております。マニュアル通り、providersとaliasesへの登録です。これが誤りということでしょうか。

Answer 1

config/appには追加しております。マニュアル通り、providersとaliasesへの登録です。

結論から言うとそれらを削除してください。

composerの設定を見る限り、"laravel/framework": "5.6.*"かつ、"barryvdh/laravel-debugbar": "^3.2"なのでパッケージディスカバリに対応しています。

どのマニュアルを見られたかわかりませんが、公式のインストール手順にも条件を満たせば以下だけ実行すれば良いと書いてあります。その条件は上記の通り満たされているようなので。

composer require barryvdh/laravel-debugbar --dev