Console error: failed to load resources server responded with status 400

I am seeing this in the console log

clicking on the index.html:1 (bottom right of image ) I see

{"code":6043,"message":"Developer preview session for UI builder is not longer valid. Please go to UI Builder to initiate a new preview session","errorData":{}}

I have logged out and reloaded the page but still see this error. What am I doing wrong and how can I fix this?

I really appreciate your time,

Hi @hharrington,

When you open the preview page, the token is only valid for 30 minutes. In this case, close the preview page and reopen it by clicking the preview icon in the Frontend section.