BookMarkWorkItem exception

Attach browser selector is valid at design time, but when the bot runs, it fails. I displayed the stack trace, and found that it is related to BookmarkWorkItem. I have not knowledge of this.
The page that is automated was bookmarked, but when I started getting this error, I removed the bookmark, but still getting the same error. Every time the bot fails, I will validate the selector in studio and the page will be found. The elements inside the attach browser activity are detected correctly too.
Please, see my screenshot for the exception I am getting at runtime.

Is the page open before you call the Attach Browser activity?