Magento2 can't disable/enable module, error "warning generated/code/Magento/Framework/App/Config/InitialConfigSource/Proxy.php"

 cause of the issue in my case --no-dev :

php7.4 /usr/local/bin/composer2 dump-autoload --no-dev --optimize

after running php7.4 /usr/local/bin/composer2 dump-autoload --optimize

 disable/enable module was working