octobercms/october · error · SystemException

The Table widget data source class "%s" is could not be foun

Error message

The Table widget data source class "%s" is could not be found.

What it means

Error "The Table widget data source class "%s" is could not be found." thrown in octobercms/october.

Source

Thrown at modules/backend/widgets/Table.php:79

    public function init()
    {
        $this->columns = $this->getConfig('columns', []);

        $this->fieldName = $this->getConfig('fieldName', $this->alias);

        $this->recordsKeyFrom = $this->getConfig('keyFrom', 'id');

        $dataSourceClass = $this->getConfig('dataSource');
        if (!strlen($dataSourceClass)) {
            throw new SystemException('The Table widget data source is not specified in the configuration.');
        }

        if (array_key_exists($dataSourceClass, $this->dataSourceAliases)) {
            $dataSourceClass = $this->dataSourceAliases[$dataSourceClass];
        }

        if (!class_exists($dataSourceClass)) {
            throw new SystemException(sprintf('The Table widget data source class "%s" is could not be found.', $dataSourceClass));
        }

        $this->dataSource = new $dataSourceClass($this->recordsKeyFrom);

        // Load data into the client memory data source on POST
        if (Request::method() == 'POST' && $this->isClientDataSource()) {
            if (strpos($this->fieldName, '[') === false) {
                $requestData = post($this->fieldName . 'TableData');
            }
            else {
                $requestData = post($this->fieldName . '[TableData]');
            }

            if ($requestData) {
                $requestData = json_decode($requestData, true);
            }

            if ($requestData) {

View on GitHub (pinned to b608633a7e)

When it happens

Trigger: Thrown at modules/backend/widgets/Table.php:79 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/7291268a631147b5. Report an issue: GitHub.