This article addresses the issue where "This project has been updated. Please refresh your browser" error message is seen upon clicking the Guides panel in browser.
The underlying cause of this issue is the missing Directory Panel or missing Styles issue where pages without a base style lead to am empty directory panel in browser.
Fixing this issue requires you to fix the missing directory panel issue first, which is discussed in the following article.
If you are hitting the "This project has been updated. Please refresh your browser" error message but the directory panel is not blank for your project, please feel free to contact Support with an iDoc of your project and relevant Studio or Definition Center logs.