mtvbrianking / laravel-ussd

src/Support/helpers.php

<?php

use Illuminate\Container\Container;
use Illuminate\Contracts\Config\Repository as ConfigRepository;

if (! function_exists('menu_path')) {
    /**
     * Get the path to the menus directory.
     */
    function menu_path(string $path = ''): string
    {
        $app = Container::getInstance();

        $config = $app->make(ConfigRepository::class);

        $menusDir = $config->get('ussd.menu-path');

        $path = $path ? DIRECTORY_SEPARATOR.ltrim($path, DIRECTORY_SEPARATOR) : $path;

        return $app->basePath($menusDir.$path);

The method basePath() does not exist on Illuminate\Container\Container. Are you sure you never get this type here, but always one of the subclasses?

    }
}