The Derby driver could not be loaded.
Explanation
An unrecoverable error occurred while loading the driver to the Derby database that the Rational Adapter for HP ALM uses to store its configuration.
User response
This error might indicate that the product was not properly installed. Consider reinstalling the product. If using Tomcat, stop the server and delete the HP/server/tomcat/webapps/hpqm directory under the product install root. This forces Tomcat to redploy the web application.