CLI Upgrade error 5.6.14 5.7.11

[Jakub]

I got this error when try to upgrade:
php command.php upgrade
PHP Catchable fatal error: Argument 1 passed to Espo\Core\Container::get() must be an instance of Espo\Core\string, string given, called in /var/www/clients/client0/web12/web/application/Espo/Core/Application.php on line 48 and defined in /var/www/clients/client0/web12/web/application/Espo/Core/Container.php on line 41

Does somebody know what could be issue?

[Maximus]

Hello,
please run this command in a terminal in order to check your PHP CLI version. Probably your PHP CLI version is lower then required:

php -v