Analytics has encountered an unexpected condition and cannot fulfill your request

Disable AdBlock in your browser, and you'll be able to access your reports again.

Edit: Another fix. When you access your GA page, you'll see a URL like this:

https://ads.google.com/analytics/web/?hl=en#home/aBunchOfNumbersAndLetters/

Change the "ads" to "www":

https://www.google.com/analytics/web/?hl=en#home/aBunchOfNumbersAndLetters/

That "ads" in the URL is triggering misbehavior by AdBlock

Another extension that causes Analytics to stop working is uBlock Origin. If you disable that extension when you are on the analytics site, it starts working again.

If the problem is the adblocker, you can try whitelisting the Analytics website. For uBlock Origin you need to go to the extension settings, select the tab Whitelist, and then add the Google Analytics link (analytics.google.com) to it.