如何修复以下PHP警告？

I am working on an old project which is built on Laravel 5.2 The application was attacked and site was down. I removed the infected code, But now I am getting the following error:

PHP Warning: require(): Filename cannot be empty in public_html/vendor/laravel/framework/src/Illuminate/Foundation/Bootstrap/LoadConfiguration.php on line 60

The following code is in the file where the error is:

protected function loadConfigurationFiles(Application $app, RepositoryContract $repository)
    {
        foreach ($this->getConfigurationFiles($app) as $key => $path) {
            $repository->set($key, require $path);
        }
    }

How can I solve this?