Sitemap not generated – Errors

Hello,

i use This plugin and my sitemap is not generated i see errors when i try to reach it.

when i search in unix “find . -name sitemap.xml” nothing is found.

on the plugin page i see this “The URL to your sitemap index file is: https://www.immoel.com/sitemap.xml.”

and when i reach the url https://www.immoel.com/sitemap.xml i get many errors.
And i was searching for a button on plugin page to generate the sitemap.xml
i could not find it. How can i manually generate the sitemap file ?

Is it suppose to be generated automatically ?

Thanks for help
Dan

https://www.ads-software.com/plugins/google-sitemap-generator/