作曲家错误：无法扫描“ ..... / ScriptHandler.php”内部的类，该类似乎既不是文件也不是文件夹

Question

这是How to add a few extra packages with a second composer.json, without composer deleting all my packages?

的后续活动

不幸的是，当我尝试将所有软件包打包到自定义软件包（dennis00 / denpal）中并使用该软件包时，composer出现错误。

[RuntimeException]
Could not scan for classes inside "/home/dennis/denpal/denpal-example/vendor2/dennis00/denpal/scripts/composer/ScriptHandler.php" which does not appear to be a file nor a folder

cat composer.json

{
    "name": "dennis00/denpal-example",
    "description": "Example of Denpal",
    "type": "project",
    "license": "GPL-2.0+",
    "minimum-stability": "dev",
    "config":
      {
        "vendor-dir": "vendor2"
      },
    "repositories": [
        {
            "type": "composer",
            "url": "https://packages.drupal.org/8"
        }
    ],
    "autoload": {
        "classmap": [
            "scripts/composer/ScriptHandler.php"
        ]
    },
    "require": {
  "dennis00/denpal": "dev-master@dev",
        "drutiny/drutiny": "2.3.*@dev"
    }
}

ls vendor2 /

alchemy  brumann    composer       dennis00  doctrine         drush    egulias  guzzlehttp     knplabs      nikic      psr        romaricdrigon  stecman      twig    webmozart
asm89    caseyamcl  consolidation  dflydev   drupal           drutiny  erusev   jakub-onderka  masterminds  paragonie  psy        solarium       symfony      typo3   zendframework
bin      cocur      cweagans       dnoegel   drupal-composer  easyrdf  fiasco   kevinrob       mustache     pear       ralouphie  stack          symfony-cmf  webflo