includeCssFile and includeJsFile doesn't output {{ siteUrl }}
When you want to output Twig variables inside another Twig tag, you shouldn't include the braces around the variable.

So this:

{% includeCssFile "{{ siteUrl }}css/modul.min.css" %}
{% includeJsFile "{{ siteUrl }}js/ui.min.js" %}


Should be this:

{% includeCssFile siteUrl ~ "css/modul.min.css" %}
{% includeJsFile siteUrl ~ "js/ui.min.js" %}


These examples use the concatenation operator (~) to join the value held in the siteUrl variable to the string holding the path to the CSS or JS file to be included.