if a plugin post install is in error, the whole plugin administration page goes white with:
2022/05/18 11:50:36 [error] 1266#1266: *731 FastCGI sent in stderr: "PHP message: PHP Fatal error: Uncaught Error: Call to undefined method Tuleap\Theme\BurningParrot\BurningParrotTheme::addFeeback() in /usr/share/tuleap/plugins/pluginsadministration/include/PluginsAdministrationActions.class.php:94
Stack trace:
#0 /usr/share/tuleap/src/common/mvc/Actions.class.php(56): PluginsAdministrationActions->install()
#1 /usr/share/tuleap/src/common/mvc/Controler.class.php(59): Actions->process()
#2 /usr/share/tuleap/src/common/mvc/Controler.class.php(67): Controler->actionsManagement()
#3 /usr/share/tuleap/plugins/pluginsadministration/include/pluginsadministrationPlugin.php(79): Controler->process()
#4 /usr/share/tuleap/src/common/Plugin/PluginLegacyController.php(55): PluginsAdministrationPlugin->process()
#5 /usr/share/tuleap/src/common/Request/FrontRouter.php(250): Tuleap\Plugin\PluginLegacyController->process()
#6 /usr/share/tuleap/src/common/Request/FrontRouter.php(108): Tuleap\Request\FrontRouter->routeHandler()