octobercms/october · error · ApplicationException

List used in :class has no list columns defined.

Error message

List used in :class has no list columns defined.

What it means

Error "List used in :class has no list columns defined." thrown in octobercms/october.

Source

Thrown at modules/backend/widgets/Lists.php:970

     * defineListColumns builds an array of list columns with keys as the column name
     * and values as a ListColumn object
     */
    protected function defineListColumns(): array
    {
        if (!isset($this->columns) || !is_array($this->columns)) {
            $this->columns = [];
        }

        if ($this->columns) {
            $this->addColumns($this->columns);
        }
        else {
            $this->addColumnsFromModel();
        }

        if (!$this->allColumns) {
            $class = get_class($this->model instanceof Model ? $this->model : $this->controller);
            throw new ApplicationException(Lang::get('backend::lang.list.missing_columns', compact('class')));
        }

        /**
         * @event backend.list.extendColumns
         * Provides an opportunity to modify the columns of a List widget
         *
         * Example usage:
         *
         *     Event::listen('backend.list.extendColumns', function ($listWidget) {
         *         // Only for the User controller
         *         if (!$listWidget->getController() instanceof \Backend\Controllers\Users) {
         *             return;
         *         }
         *
         *         // Only for the User model
         *         if (!$listWidget->model instanceof \Backend\Models\User) {
         *             return;
         *         }

View on GitHub (pinned to b608633a7e)

When it happens

Trigger: Thrown at modules/backend/widgets/Lists.php:970 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/cb90924a722daa71. Report an issue: GitHub.