This section is used for troubleshooting the Blogging bundle.
These are most likely caused by a wrong end-point configuration.
Try to open the end-point that you have configured in your browser.
If you get something like:
2006-06-20 17:54:11.197 CocoaDialog ...
Shown e.g. at the top of a fetched post, then it is likely because you have an input manager installed in
~/Library/InputManagers which put out this debug information.
In next version this information should be suppressed (by redirecting to
/dev/console/) — you can grab that from the Bundles repository, or alternatively, get rid of the input manager which outputs the debug information.