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Thanks for your help knacky,
I followed the doc. I just forgot to target the controller.

My module

class Gaston extends Module
{    
    public function __construct()
    {
        $this->tabs = [   
                'name' => 'Gaston',
                'class_name' => 'Gaston',
                'visible' => true      
        ];
            
        $this->name = 'Gaston';
//...
}

My Controller

class GastonController extends FrameworkBundleAdminController
{
//...
}