I have installed the https://our.umbraco.com/packages/website-utilities/cultiv-search-engine-sitemap/ package.

I have working as expected but when i use a robots.txt file to link to the sitemap, i get the below error and therefore returns 500.

Could not load file or assembly 'Cultiv.DynamicRobots' or one of its dependencies. The system cannot find the file specified.

But when i visit the Sitemap URL within the robots.txt file, it loads the sitemap.aspx page correctly with the xml on the page.

Robots.txt file contents:

User-agent: *

    Allow: /

    Sitemap: http://URL/sitemap.aspx

Thank you for any help :)