после того, как выбираю язык в начале установки, получается такая ошибка:
Requirements problem
The following error must be resolved before you can continue the installation process:
The Drupal installer requires that you create a settings file as part of the installation process.
Copy the ./sites/default/default.settings.php file to ./sites/default/settings.php.
Change file permissions so that it is writable by the web server. If you are unsure how to grant file permissions, please consult the on-line handbook.
More details about installing Drupal are available in INSTALL.txt.
The following installation warning should be carefully reviewed:
Operations on Unicode strings are emulated on a best-effort basis. Install the PHP mbstring extension for improved Unicode support. (Currently using Unicode library Standard PHP)

Please check the error messages and try again.

подскажите, что мне делать