Undefined constant CodeIgniter\Router\Router::HTTP_METHODS

Hi guys,

Can someone tell me what this error means? I can see the constant is defined in Router.php.

Code:

CRITICAL - 2024-06-25 16:30:02 --> Error: Undefined constant CodeIgniter\Router\Router::HTTP_METHODS
in SYSTEMPATH\Router\DefinedRouteCollector.php on line 35.
1 SYSTEMPATH\Debug\Toolbar\Collectors\Routes.php(105): CodeIgniter\Router\DefinedRouteCollector->collect()
2 SYSTEMPATH\Debug\Toolbar\Collectors\BaseCollector.php(226): CodeIgniter\Debug\Toolbar\Collectors\Routes->display()
3 SYSTEMPATH\Debug\Toolbar.php(93): CodeIgniter\Debug\Toolbar\Collectors\BaseCollector->getAsArray()
4 SYSTEMPATH\Debug\Toolbar.php(370): CodeIgniter\Debug\Toolbar->run(1719304186.26961, 16.1719, Object(CodeIgniter\HTTP\IncomingRequest), Object(CodeIgniter\HTTP\Response))
5 SYSTEMPATH\Filters\DebugToolbar.php(43): CodeIgniter\Debug\Toolbar->prepare(Object(CodeIgniter\HTTP\IncomingRequest), Object(CodeIgniter\HTTP\Response))
6 SYSTEMPATH\Filters\Filters.php(211): CodeIgniter\Filters\DebugToolbar->after(Object(CodeIgniter\HTTP\IncomingRequest), Object(CodeIgniter\HTTP\Response), null)
7 SYSTEMPATH\CodeIgniter.php(522): CodeIgniter\Filters\Filters->run('update/install', 'after')
8 SYSTEMPATH\CodeIgniter.php(361): CodeIgniter\CodeIgniter->handleRequest(null, Object(Config\Cache), false)
9 FCPATH\index.php(79): CodeIgniter\CodeIgniter->run()

PHP Code:

class Router implements RouterInterface
{
    /**
    * List of allowed HTTP methods (and CLI for command line use).
    */
    public const HTTP_METHODS = [
        Method::GET,
        Method::HEAD,
        Method::POST,
        Method::PATCH,
        Method::PUT,
        Method::DELETE,
        Method::OPTIONS,
        Method::TRACE,
        Method::CONNECT,
        'CLI',
    ];