If the error/issue is different than that other post, then definitely good to start a new post.

That said the particular log file does not appear to report any issues and in fact identifies a success at the end. As to the error message in red, would seem that there would likely be something more in one of the other emails or in the debug log (if enabled) that would be generated as part of trouble shooting.

As part of describing the issue, there isn't anything about other pertinent details such as are you using the same PayPal credentials as associated with the store? What payment options (ie. Credit cards) are enabled in the configuration section, was this site an upgraded site, if so how was the upgrade performed? Was the paypal payment method removed and reinstalled in the process?

The next question though is, what is it that is trying to be fixed? It is not clear that there is an issue to resolve. If it is that you're receiving emails, then turn off the email portion of the debug. If it's the red text information, then that wasn't too clear and it would help to identify more about where that message is generated to be seen/found.