Laravel 10: Class "League\Flysystem\AwsS3V3\PortableVisibilityConverter" not found
Stefan Izdrail
Founder & Senior Architect · 2026-06-29
Title: Troubleshooting the Laravel 10 Composer Issue with "League\Flysystem\AwsS3V3\PortableVisibilityConverter" Not Found
Body:
In one of your projects, you might encounter an error in your production environment while everything is working fine locally. This can often be a result of various issues related to the Composer ecosystem. This blog post aims at providing a comprehensive guide on how to go about troubleshooting this problem and ensuring that your Laravel 10 application functions smoothly across environments.
Firstly, make sure you are running the latest version of PHP and the Composer installer. In order to maintain consistency with your project requirements, ensure you have the same versions installed on both your local and production environments. For example:
```bash
sudo apt-get update && upgrade -y
sudo curl -s https://getcomposer.org/installer | php
sudo mv composer.phar /usr/local/bin/composer
php -r "readfile('https://raw.githubusercontent.com/laravel/framework/master/scripts/install-app.sh');" < /dev/null; exit 0
```
Ensure you have the necessary dependencies in your `composer.json` file, including:
```json
{
"require": {
"league/flysystem-aws-s3-v3": "^3.0",
"laravel/telescope": "~5.1"
},
"require-dev": {
"fideloper/phpunit-laravel": "~9.0"
}
}
```
Now, let's go through a step-by-step process to troubleshoot the issue.
1. Update your project dependencies:
```bash
composer update --with-all-dependencies
```
Composer will fetch all the required packages and their dependencies, ensuring that everything is up-to-date. If this step doesn't fix the problem, proceed to the next one. This could be due to package conflicts or a clash between dependencies.
2. Clear your project cache:
```bash
php artisan optimize --force
```
The `--force` option forces Laravel to clear all the cached data. In some cases, this helps resolve the class not found issue. If it doesn't work for you, try the next step.
3. Regenerate your autoloader:
```bash
composer dump-autoload
```
This command generates a new autoload file that specifies the classes and files to be loaded dynamically as needed by your project, ensuring all dependencies are up-to-date. In case the error persists, move on to the next step.
4. Completely remove your vendor folder and reinstall composer:
```bash
rm -fr vendor/* && rm composer.lock
composer install
```
This ensures that you are working with a clean environment with all required packages installed using Composer again. If the issue persists after this step, you may need to contact package maintainers for support or search for relevant solutions online.
5. Run 'composer update' with full dump-autoload:
```bash
composer update --with-all-dependencies && composer dump-autoload
```
This command ensures that you are using the most up-to-date versions of all dependencies and automatically registers them. If this doesn't solve your problem, you may want to inspect the class loading order or your project structure for potential conflicts or inconsistencies.
If none of these steps resolve your issue, it might be worth considering alternative storage solutions like Amazon S3 or local file-based storage, such as the default FileSystemAdapter included in Laravel. This can help you rule out any package specific issues and provide insights into which solution works best for your project.
In conclusion, troubleshooting class not found errors in Laravel 10 requires patience, persistence, and careful attention to detail. By following these steps and seeking support from the community or package maintainers when necessary, you can ensure that your application runs smoothly across all environments.