A critical error occurred on my site since i did a Xstore update -I can't access wordpress dashboard

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I have updated WordPress in last version. Everything was ok. But when I asked an update to XStore plugin I had the message: “A critical error occurred on your site.with plugin XStore Core”.

Then in my email I received :
" … If your site appears broken and you can’t access your dashboard
normally, WordPress now has a special “recovery mode”. This lets you
safely login to your dashboard and investigate further. …"

… and a link to recover. But after 2 tries it delivers to me the same message:
“Recovery Mode not initialized.”

Please help

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