Hi,

If we rename the 'adm' folder and try to enable an extension, we encounter the following error:

Fatal error: Uncaught exception 'Twig_Error_Loader' with message 'Unable to find template "acp_ext_enable.html" (looked into: ).' in /var/www/clients/client3/web24/web/forums/vendor/twig/twig/lib/Twig/Loader/Filesystem.php:232 Stack trace:
#0 /var/www/clients/client3/web24/web/forums/phpbb/template/twig/loader.php(135): Twig_Loader_Filesystem->findTemplate('acp_ext_enable....')
#1 /var/www/clients/client3/web24/web/forums/vendor/twig/twig/lib/Twig/Loader/Filesystem.php(150): phpbb\template\twig\loader->findTemplate('acp_ext_enable....')
#2 /var/www/clients/client3/web24/web/forums/vendor/twig/twig/lib/Twig/Environment.php(329): Twig_Loader_Filesystem->getCacheKey('acp_ext_enable....')
#3 /var/www/clients/client3/web24/web/forums/vendor/twig/twig/lib/Twig/Environment.php(419): Twig_Environment->getTemplateClass('acp_ext_enable....')
#4 /var/www/clients/client3/web24/web/forums/phpbb/template/twig/environment.php(277): Twig_Environment->loadTemplate('acp_ext_enable....', NULL)
#5 /var/www/clients/client3/web24/web/forums/ve in /var/www/clients/client3/web24/web/forums/vendor/twig/twig/lib/Twig/Loader/Filesystem.php on line 232

This error only appears when an extension is enabled.
No errors during disabling or deletion.