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I see you are trying the new Symfony way so your controller should live in src/Controllers/Admin/ and in composer.json add:

"autoload": {
    "psr-4": {
      "your_module_name\\": "src/"
    }

And of course, run

composer dumpautoload

afterwards.

I see you are trying the new Symfony way so your controller shlould live in src/Controllers/Admin/ and in composer.json add:

"autoload": {
    "psr-4": {
      "your_module_name\\": "src/"
    }

And of course, run

composer dumpautoload

afterwards.