yiisoft/yii2 · error · Exception

No help for unknown command "$name".

Error message

No help for unknown command "$name".

What it means

Error "No help for unknown command "$name"." thrown in yiisoft/yii2.

Source

Thrown at framework/console/controllers/HelpController.php:62

 */
class HelpController extends Controller
{
    /**
     * Displays available commands or the detailed information
     * about a particular command.
     *
     * @param string|null $command The name of the command to show help about.
     * If not provided, all available commands will be displayed.
     * @return int the exit status
     * @throws Exception if the command for help is unknown
     */
    public function actionIndex($command = null)
    {
        if ($command !== null) {
            $result = Yii::$app->createController($command);
            if ($result === false) {
                $name = $this->ansiFormat($command, Console::FG_YELLOW);
                throw new Exception("No help for unknown command \"$name\".");
            }

            list($controller, $actionID) = $result;

            $actions = $this->getActions($controller);
            if ($actionID !== '' || count($actions) === 1 && $actions[0] === $controller->defaultAction) {
                $this->getSubCommandHelp($controller, $actionID);
            } else {
                $this->getCommandHelp($controller);
            }
        } else {
            $this->getDefaultHelp();
        }

        return ExitCode::OK;
    }

    /**

View on GitHub (pinned to 66f00d18a2)

When it happens

Trigger: Thrown at framework/console/controllers/HelpController.php:62 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of yiisoft/yii2@66f00d18a2 (2026-08-17). Data as JSON: /api/errors/2f120a5302be6fe3. Report an issue: GitHub.