After comparing the 2 web.config files I see the difference: type = "DotNetNuke.SitemapProviders.CoreSitemapProvider, DotNetNuke" and type = "DotNetNuke.Services.Sitemap.CoreSitemapProvider, DotNetNuke" (this works)
I do not understand why the above error occurred because I did not edit it in web.config. Thanks for Sebastian Leupold helping me. Please close this topic. Thank you very much.
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