octobercms/october · error · ApplicationException

Unable to find the active theme.

Error message

Unable to find the active theme.

What it means

Error "Unable to find the active theme." thrown in octobercms/october.

Source

Thrown at modules/cms/models/MaintenanceSetting.php:91

    {
        if (!System::hasDatabase()) {
            return false;
        }

        if (BackendAuth::userHasAccess('general.backend.view_offline')) {
            return false;
        }

        return self::get('is_enabled', false);
    }

    /**
     * getCmsPageOptions
     */
    public function getCmsPageOptions()
    {
        if (!$theme = $this->findTargetTheme()) {
            throw new ApplicationException('Unable to find the active theme.');
        }

        return array_map(function($code) use ($theme) {
            return "{$theme->getDirName()}/{$code}";
        }, Page::listInTheme($theme)->lists('fileName', 'fileName'));
    }

    /**
     * beforeValidate ensures each theme has its own CMS page, store it inside a mapping array.
     */
    public function beforeValidate()
    {
        if (!$theme = $this->findTargetTheme()) {
            throw new ApplicationException('Unable to find the active theme.');
        }

        $themeMap = (array) $this->theme_map;
        $themeMap[$theme->getDirName()] = $this->cms_page;

View on GitHub (pinned to b608633a7e)

When it happens

Trigger: Thrown at modules/cms/models/MaintenanceSetting.php:91 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of octobercms/october@b608633a7e (2026-08-21). Data as JSON: /api/errors/3f64e3c98c4fc578. Report an issue: GitHub.