sitemap couldnt fletch

Hello,
This is for my new website inside the google search console when I submit the sitemap it’s giving me a status error couldn’t fletch the sitemap. I never saw this kind of error on my old website and I use rankmath.

Need your help to fix this. I search on google saw a lot of people who are using rankmath get this error but didn’t find any solution.

I have also attached the screenshot link for your convenience.
https://hamiltoncellphonerepair.ca

Thank you
Suleman