Sorry to hear about that. The error you're seeing is indicating that Trello is having trouble loading. That's most likely caused by something like your browser's settings or a network firewall.
I'd recommend reviewing our help docs here to troubleshoot this:
https://help.trello.com/article/736-troubleshooting-browser-issues-with-trello
https://help.trello.com/article/1072-configuring-your-firewall-for-trello
https://help.trello.com/article/771-loading-resources-from-trellos-cdn
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