Class cannot be found, but it’s available in the file, I get: Fatal Error: Uncaught Error: Class ‘Blocks\Base\Activation’ not found

It was a caching problem with composer.

I retroactively changed my composer.json, so I had to open my terminal and run composer dumpautoload to correct the cache.

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Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)