Error with template function

Hello,
I see this error:

Warning: file_exists(): open_basedir restriction in effect. File(/.php) is not within the allowed path(s): (/data/www/19737/cyklo-turistika_cz) in /data/www/19737/cyklo-turistika_cz/www/wp-content/plugins/directorist/includes/template-functions.php on line 19

You can see it here: https://cyklo-turistika.cz/vylety/ (and on another pages)

Please, is some way to fix it?

Thanks.

The page I need help with: [log in to see the link]