Sitemap issue

I am using an xml sitemap plugin. It worked fine initially but now I keep getting the following errors

XML Parsing Error: no element found
Location: https://www.reportingaccounts.com/sitemap-pt-listing-2018-02.xml
Line Number 3, Column 236:<urlset xmlns:xsi="https://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="https://www.sitemaps.org/schemas/sitemap/0.9 https://www.sitemaps.org/schemas/sitemap/0.9/sitemap.xsd" xmlns="https://www.sitemaps.org/schemas/sitemap/0.9">

All the listings are present on the live site but the sitemap can’t seem to find them? Other sitemaps are working fine.

The sitemap in question can be found here <a href="https://www.reportingaccounts.com/sitemap-pt-listing-2018-02.xml">https://www.reportingaccounts.com/sitemap-pt-listing-2018-02.xml</a>

The page I need help with: [log in to see the link]