Validation Errors?

I am getting Validation Errors?

Fatal Error: Illegal processing instruction target (found xml)
At line 2, column 5
<?xml version=”1.0″

https://validator.w3.org/nu/?doc=https%3A%2F%2Fwww.ilgm.com%2Fcategory%2Fhow-to%2Ffeed%2F

This is happening on the main feed as well as cat specific feeds.
https://www.ilgm.com/feed/
https://www.ilgm.com/category/how-to/feed/

This error is stopping out dashboard plugin from displaying Support Posts to our clients.

Please advise.

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