I have been taking a look at this and think the error is possibly down to the Form Feed (Link to a good answer describing this on StackOverflow, it took me some googling to understand what that was) character in between the two span tags on line 41, column 45.
<p><span style="font-weight: 400;"></span></p>
Removing this should resolve the error as it appears it is not a valid character in XML 1.0.
I was in the same boat and couldn’t see anything either and could only see it once I had pasted the code into my text editor, invisible things are hard to chase!
