Error XML...how should I handle this issue? 
Autor: Alexandre A.
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How should I handle this issue? I can´t load my site.
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You already are up to date, follow this:
https://helpcenter.websitex5.com/pt/post/209486
or
https://helpcenter.websitex5.com/pt/post/208075
Hope one of these helps.
Make regular backup's in step 5 export project. (if you have one ga back to this file) this can be a tricky erro to recover.
Goodluck.