KernelPluginLoaderException example

// plugins managed by composer are already in the classMap             if ($plugin['managedByComposer']) {
                continue;
            }

            if (!isset($plugin['autoload'])) {
                $reason = sprintf(
                    'Unable to register plugin "%s" in autoload. Required property `autoload` missing.',
                    $plugin['baseClass']
                );

                throw new KernelPluginLoaderException($pluginName, $reason);
            }

            $psr4 = $plugin['autoload']['psr-4'] ?? [];
            $psr0 = $plugin['autoload']['psr-0'] ?? [];

            if (empty($psr4) && empty($psr0)) {
                $reason = sprintf(
                    'Unable to register plugin "%s" in autoload. Required property `psr-4` or `psr-0` missing in property autoload.',
                    $plugin['baseClass']
                );