![plugin development - Class cannot be found, but it's available in the file, I get: Fatal Error: Uncaught Error: Class 'Blocks\Base\Activation' not found - WordPress Development Stack Exchange plugin development - Class cannot be found, but it's available in the file, I get: Fatal Error: Uncaught Error: Class 'Blocks\Base\Activation' not found - WordPress Development Stack Exchange](https://i.stack.imgur.com/fn1wB.png)
plugin development - Class cannot be found, but it's available in the file, I get: Fatal Error: Uncaught Error: Class 'Blocks\Base\Activation' not found - WordPress Development Stack Exchange
Class "PHPStan\…" not found since Composer 2.1.0 without dumping autoload · Issue #5135 · phpstan/phpstan · GitHub
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Uncaught Error: Class "Composer\InstalledVersions" not found [phar] · Issue #7329 · vimeo/psalm · GitHub
![Fatal error: Uncaught Error: Class 'Puc_v4_Factory' not found (Composer Autoload) · Issue #321 · YahnisElsts/plugin-update-checker · GitHub Fatal error: Uncaught Error: Class 'Puc_v4_Factory' not found (Composer Autoload) · Issue #321 · YahnisElsts/plugin-update-checker · GitHub](https://user-images.githubusercontent.com/812192/66345080-4a37b900-e91d-11e9-97ce-aa17d23232ac.png)
Fatal error: Uncaught Error: Class 'Puc_v4_Factory' not found (Composer Autoload) · Issue #321 · YahnisElsts/plugin-update-checker · GitHub
![Troubleshooting "NumberFormatter Not Found" class error in Laravel PHP on Windows and Linux - Mazer.dev Troubleshooting "NumberFormatter Not Found" class error in Laravel PHP on Windows and Linux - Mazer.dev](https://mazer.dev/en/php/posts/laravel-php-class-numberformatter-not-found/featured-class-numberformatter-not-found.webp)
Troubleshooting "NumberFormatter Not Found" class error in Laravel PHP on Windows and Linux - Mazer.dev
![Fatal error: Uncaught Error: Class 'Composer\Autoload\ComposerStaticInit12b329b3bb5a50c8887651ad7396a012' not found in ... · Issue #7293 · composer/composer · GitHub Fatal error: Uncaught Error: Class 'Composer\Autoload\ComposerStaticInit12b329b3bb5a50c8887651ad7396a012' not found in ... · Issue #7293 · composer/composer · GitHub](https://user-images.githubusercontent.com/13800762/39428231-1c7e6830-4ca0-11e8-8a4b-834a919db6ae.png)