Could not scan for classes inside "/app/vendor/colinmollenhour/cache-backend-redis/Cm/Cache/Backend/Redis.php" which does not appear to be a file nor a folder

[jtphelan]

I'm getting this error during composer install.

Could not scan for classes inside "/app/vendor/colinmollenhour/cache-backend-redis/Cm/Cache/Backend/Redis.php" which does not appear to be a file nor a folder

[colinmollenhour]

I don't know, not much info to go on here...

[jtphelan]

It's a Magento/Adobe Commerce site. Here's my composer.json. I'm getting the error locally, on Platform.sh when I try to deploy and on a Vultr VPS. So it seem to not be environmental.

    "name": "magento/project-enterprise-edition",
    "description": "eCommerce Platform for Growth (Enterprise Edition)",
    "type": "project",
    "license": [
        "proprietary"
    ],
    "config": {
        "allow-plugins": {
            "dealerdirect/phpcodesniffer-composer-installer": true,
            "laminas/laminas-dependency-plugin": true,
            "magento/*": true
        },
        "preferred-install": "dist",
        "sort-packages": true
    },
    "version": "2.4.5-p1",
    "require": {
        "blackbird/contentmanager": "v100.4.75",
        "magefan/module-blog-extra": "^2.10.10",
        "magefan/module-secondblog-extra": "^2.10.10",
        "mageme/module-webforms-3": "3.0.17",
        "mageme/module-webforms-3-page-builder": "^3.0",
        "mageme/module-webforms-3-print": "^3.0",
        "magento/composer-dependency-version-audit-plugin": "~0.1",
        "magento/composer-root-update-plugin": "~2.0",
        "magento/product-enterprise-edition": "2.4.5-p1",
        "magepal/magento2-gmailsmtpapp": "^2.9",
        "mageworx/module-deliverydatemeta": "^1.17",
        "mageworx/module-nocontactdeliverymeta": "^1.1",
        "mageworx/module-storelocatormeta": "^1.12"
    },
    "autoload": {
        "exclude-from-classmap": [
            "**/dev/**",
            "**/update/**",
            "**/Test/**"
        ],
        "files": [
            "app/etc/NonComposerComponentRegistration.php"
        ],
        "psr-0": {
            "": [
                "app/code/",
                "generated/code/"
            ]
        },
        "psr-4": {
            "Magento\\": "app/code/Magento/",
            "Magento\\Framework\\": "lib/internal/Magento/Framework/",
            "Magento\\Setup\\": "setup/src/Magento/Setup/"
        }
    },
    "require-dev": {
        "allure-framework/allure-phpunit": "~1.5.0",
        "dealerdirect/phpcodesniffer-composer-installer": "^0.7.2",
        "friendsofphp/php-cs-fixer": "~3.4.0",
        "lusitanian/oauth": "~0.8.10",
        "magento/magento-coding-standard": "*",
        "magento/magento2-functional-testing-framework": "^3.7",
        "pdepend/pdepend": "~2.10.0",
        "phpmd/phpmd": "^2.12.0",
        "phpstan/phpstan": "^1.6.8",
        "phpunit/phpunit": "~9.5.20",
        "sebastian/phpcpd": "^6.0.3",
        "squizlabs/php_codesniffer": "~3.6.0",
        "symfony/finder": "^5.2"
    },
    "conflict": {
        "gene/bluefoot": "*"
    },
    "autoload-dev": {
        "psr-4": {
            "Magento\\PhpStan\\": "dev/tests/static/framework/Magento/PhpStan/",
            "Magento\\Sniffs\\": "dev/tests/static/framework/Magento/Sniffs/",
            "Magento\\TestFramework\\Inspection\\": "dev/tests/static/framework/Magento/TestFramework/Inspection/",
            "Magento\\TestFramework\\Utility\\": "dev/tests/static/framework/Magento/TestFramework/Utility/",
            "Magento\\Tools\\": "dev/tools/Magento/Tools/",
            "Magento\\Tools\\Sanity\\": "dev/build/publication/sanity/Magento/Tools/Sanity/"
        }
    },
    "minimum-stability": "stable",
    "prefer-stable": true,
    "repositories": {
        "magefan-blog-plus-extra-m2": {
            "type": "composer",
            "url": "https://magefan.com/repo/"
        },
        "magefan-sc-blog-extra-m2": {
            "type": "composer",
            "url": "https://magefan.com/repo/"
        },
        "mageworx_packages": {
            "type": "composer",
            "url": "https://packages.mageworx.com/"
        },
        "mageme": {
            "type": "composer",
            "url": "https://repo.mageme.com"
        },
        "0": {
            "type": "composer",
            "url": "https://repo.magento.com/"
        }
    },
    "extra": {
        "magento-force": "override"
    }
}```

[colinmollenhour]

That's quite a composer file!
I just tested the latest with composer require colinmollenhour/cache-backend-redis and it worked without error so I think this is possibly more of a composer issue,the composer.json file for this repo is pretty simple.
Sounds like it could be some sort of file permission or symlink issue. Are you running the latest version of composer?

[jtphelan]

Unfortunately, I'm still using composer 1 because Magento does not support version 2.