After easily instal selfoss in my webhost, I meet an error 500 at each first connection to my selfoss homepage.

The exact error is :
Internal Server Error
Fatal error: Module 'xmlwriter' already loaded

I try to play with the htaccess (rewriteBase) without success. I have always have this message at first connection and a refresh resolve the issue. It's annoying and the update process with curl is failing too.

Congratulations cause, whitout this issue, the webapp is great !