Error during installation: multisite approach - mkdir(): Not a directory in starting_point_package.php

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Hello,

I am trying to install c5 using multisite approach from here:https://www.concrete5.org/documentation/how-tos/developers/a-multi-s...

All goes well except once installation executed (after I've provided configuration details, site name etc.) I received following bunch of errors:

Warning: mkdir(): Not a directory in /var/www/c5-core/core/models/starting_point_package.php on line 154

Warning: chmod(): Not a directory in /var/www/c5-core/core/models/starting_point_package.php on line 155

Installator stucked.
I've checked the permissions and location of files and all seems ok.

Could you please advice what may be the issue?