octobercms/october · error · SystemException

Invalid field type used :type.

Error message

Invalid field type used :type.

What it means

Error "Invalid field type used :type." thrown in octobercms/october.

Source

Thrown at modules/backend/widgets/Form.php:930

        $field = new FormField([
            'fieldName' => $fieldName,
            'label' => $label,
            'arrayName' => $this->arrayName,
            'idPrefix' => $this->getId()
        ]);

        if ($fieldContext) {
            $field->context($fieldContext);
        }

        if (is_string($config)) {
            $field->displayAs($config);
        }
        else {
            $fieldType = $config['type'] ?? null;
            if (!is_string($fieldType) && $fieldType !== null) {
                throw new SystemException(Lang::get(
                    'backend::lang.field.invalid_type',
                    ['type' => gettype($fieldType)]
                ));
            }

            if ($config) {
                $field->useConfig($config);
            }

            if ($fieldType) {
                $field->displayAs($fieldType);
            }
        }

        return $field;
    }

    /**

View on GitHub (pinned to b608633a7e)

When it happens

Trigger: Thrown at modules/backend/widgets/Form.php:930 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/1d2145ac35256d14. Report an issue: GitHub.