Fatal error: Call to undefined function pagination()

Hi,

I’m using WPMultisite. When creating a blog page, the next fatal error appeared:
Fatal error: Call to undefined function chabelle_pagination() in /home/usr1/chabelle/public_html/wp-content/themes/Chabelle_cbs/template_blog.php on line 47
I’ve searched the line of code => chabelle_pagination($query_string);

Anyone having a solution? I just want to use this page as the blog page.
url: https://chabelle.be/cbs/nieuws-cbs/

Thanks in advance!