Encoding error for opening sitemap

Hi there,

I am trying to open site map http://myagency.azurewebsites.net/sitemap.xml, but shows below error:

This page contains the following errors:

error on line 3 at column 1: Encoding error
Below is a rendering of the page up to the first error.

can you show me what could i do? Thanks!

https://ww.wp.xz.cn/plugins/all-in-one-seo-pack/