Probem sitemap.xml

I noticed a problem with my sitemap.

XML parsing error: no elements found
Location: https://www.twoforlife.com/sitemap.xml
Line number 1, Column 1:

I click on save, the site map is correctly generated.

But if I come back to see some time later, I have the same problem again.

The good file generated a little before is replaced by an empty file and it is declared again as not generated in the amdin pannel.

Where does the problem comes from?

Nobody has any idea for my problem?

You can try this

  Go into the admin panel -tools- cache  clears the cache then go into sitemap ticks the box to generate the file then applies one of two methods described there to inform the search engines

Thanks, but it still does not work even after you emptied the cache and refreshed sitemap.xml. An other idea?

You might have to check any modules that has sitemap info added to it. Sometimes I have found modules that cause errors. Don't remember which ones they were but the developer fixed the ones I found. Does it show anything in a error log file?

When you click on "generate sitemap" then it's run straight away, but when it is run automatically the

sitemap is generated upon cron run. It maybe you have different PHP configurations for cron and for website - this maybe a reason of the problem.

It's just, thank you, I'll look that way.