the error seems to be related with the synchronization of Derby Database.
Since Derby is embedded into Tomcat, you should try to Stop Tomcat before publishing the process. At the end of the publishing you can Start again Tomcat.
The installation of WebRatio on a Mac OS requires the modification of the permissions of
specific files. I suggest you to check these modifications, described in the WebRatio Release Notes or in the WebRatio wiki, at the following page.