I can not generate a sitemap

I installed sitemap in varios pages and it works well. But in the page villaaxarquia.de is can not generate a sitemap. Everytime a withe screen will come and nothing is moving.
What do I need to do? I reinstagged Sitemap but the same , I checked the access rights at the page, the same like my other pages (710)

Typically, problems arise for the following reasons, incorrect rights for the hosting user. As a result, the file cannot be created or read from outside.
Check if the sitemap.xml file is in the root of the site

If the file was created but can not be read, then most likely in the settings hosting zaprscheno reading xml files.