Fatal Error Issue — Can’t access WP admin and website is down

I tried to activate Google XML sitemap plugin and looks like it crashed everything. I can’t access WP admin or my site. This is the error message:

Fatal error: Cannot redeclare class GoogleSitemapGeneratorLoader in /home/content/16/3787716/html/wp-content/plugins/google-xml-sitemaps-v3-for-qtranslate/sitemap.php on line 43

I would appreciate any help. Thanks very much.

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