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in Plugins by

I use Ultimate Seo and In sitemap
when I click on 
https://www.website.com/sitemap-index.xml
or
its shown this HTTP ERROR 500
see img below:

by
Check your webserver logs. There should be more information about the error in them.
by
Sorry,  but from where can I access to the webserver logs.
by
That depends on your hosting and your webserver. If you have shell access they're typically located under /var/log/<webserver> (/var/log/apache2 for Apache, /var/log/nginx for Nginx, etc.).

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