Petals ESB Container

If:
1) I move the file topology.xml from PETALS_HOME/conf to PETALS_HOME,
2) I configure in the file server.properties the parameter 'petals.topology.url' to 'file:///PETALS_HOME/topology.xml'

I get the following erreur when launching Petals:
[Petals.Tools.WebServiceManagerImpl]-INFO 2010-08-25 09:37:11,941 Kernel Web service 'ServiceAssemblyStateService' has been added and is available at 'http://localhost:7600/petals/ws/ServiceAssemblyStateService'
[Petals.Tools.WebServiceManagerImpl]-INFO 2010-08-25 09:37:11,972 Kernel Web service 'RuntimeService' has been added and is available at 'http://localhost:7600/petals/ws/RuntimeService'
[Petals.Tools.WebServiceManagerImpl]-INFO 2010-08-25 09:37:11,987 Kernel Web service 'InformationService' has been added and is available at 'http://localhost:7600/petals/ws/InformationService'

PEtALS ESB platform distribution successfully started - 25/08/10 09:37
Command processing error : start
java.io.IOException: Failed to reach the resource '/topology.xml'
at org.ow2.petals.launcher.PlatformLauncher.getJMXClient(PlatformLauncher.java:85)
at org.ow2.petals.launcher.AbstractLauncher.start(AbstractLauncher.java:191)
at org.ow2.petals.launcher.AbstractLauncher.launch(AbstractLauncher.java:147)
at org.ow2.petals.distribution.platform.Main.main(Main.java:42)