octobercms/october · error · SystemException

Invalid tree display mode: {}

Error message

Invalid tree display mode: {}

What it means

Error "Invalid tree display mode: {}" thrown in octobercms/october.

Source

Thrown at modules/backend/vuecomponents/treeview/NodeDefinition.php:141

    protected $hideInQuickAccess = false;

    /**
     * __construct
     */
    public function __construct(string $label, string $key)
    {
        $this->label = $label;
        $this->key = $key;
    }

    /**
     * Sets tree branch display mode - tree or list.
     * Only the root node display mode is considered.
     */
    public function setDisplayMode(string $value)
    {
        if (!in_array($value, [self::DISPLAY_MODE_TREE, self::DISPLAY_MODE_LIST])) {
            throw new SystemException('Invalid tree display mode: '.$value);
        }

        if ($this->groupBy) {
            throw new SystemException('Treeview branch grouping is only supported for the LIST display mode');
        }

        $this->displayMode = $value;

        return $this;
    }

    /**
     * Determines whether multiple nodes can be selected.
     * Only the root node property value is considered.
     */
    public function setMultiSelect(bool $value)
    {
        $this->multiSelect = $value;

View on GitHub (pinned to b608633a7e)

When it happens

Trigger: Thrown at modules/backend/vuecomponents/treeview/NodeDefinition.php:141 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/a4b710b94782f78f. Report an issue: GitHub.