I'm having trouble with sitemaps

Hi there,
Since installing Hummingbird Pro, an error appears on Google Search Console:
Sitemap can be read, but has errors
Parsing error
1 instance
We were unable to read your Sitemap. It may contain an entry we are unable to recognise. Please validate your Sitemap before resubmitting.
Examples
Line 1
If there anyway to fix this issue?
Thanks,
James