Hi Lindsay!
Sorry to hear you've hit this snag while working in Reach 360!
Glad to see Karl has been helping you out! Checking our status page, I'm not seeing any downtime reported for Reach 360 today. Like Karl, I was able to access Reach 360 without issues. To clarify, are you observing this error across multiple browsers, or is it local to one? Also, does clearing your browser's cache improve the behavior?
If still unsuccessful, please connect with our support engineers through a support case. They'd be happy to continue troubleshooting with you!