Hi there @Dogify2023, 

Happy to help! 

In my experience, whenever you get an error like this, the following are great troubleshooting procedures to fix this issue:

• Clear your cache/cookies
• Refresh the browser window
• Open your account again in an incognito browser

If you’re still experiencing an issue, a Klaviyo alum shared a more extensive troubleshooting list that you can use to solve this error message and get to work! 

Thanks for participating in the Community!

-Taylor