Universal Wiki Converter is not compatible with Confluence 4.0

While trying to import data from our existing wiki (Foswiki) using the universal wiki converter, I got this exception in the logs :
org.apache.xmlrpc.XmlRpcException: java.lang.Exception: com.atlassian.confluence.rpc.RemoteException: Unsupported operation: Wiki formatted content can no longer be retrieved from this API. Please use the version 2 API. The version 2 WSDL is available at: http://web2:8090/rpc/soap-axis/confluenceservice-v2?wsdl. XML-RPC requests should prefixed with "confluence2.". Please use getPageSummary() to get page data without its content.
at org.apache.xmlrpc.XmlRpcClientResponseProcessor.decodeException(XmlRpcClientResponseProcessor.java:104)
at org.apache.xmlrpc.XmlRpcClientResponseProcessor.decodeResponse(XmlRpcClientResponseProcessor.java:71)
at org.apache.xmlrpc.XmlRpcClientWorker.execute(XmlRpcClientWorker.java:73)
at org.apache.xmlrpc.XmlRpcClient.execute(XmlRpcClient.java:194)
at org.apache.xmlrpc.XmlRpcClient.execute(XmlRpcClient.java:185)
at org.apache.xmlrpc.XmlRpcClient.execute(XmlRpcClient.java:178)
at biz.artemis.confluence.xmlrpcwrapper.RemoteWikiBroker.populatePageXmlRpcData(RemoteWikiBroker.java:208)
at biz.artemis.confluence.xmlrpcwrapper.RemoteWikiBroker.storeNewOrUpdatePage(RemoteWikiBroker.java:260)
at com.atlassian.uwc.ui.ConverterEngine.sendPage(ConverterEngine.java:1742)
at com.atlassian.uwc.ui.ConverterEngine.sendPage(ConverterEngine.java:1859)
at com.atlassian.uwc.ui.ConverterEngine.sendPage(ConverterEngine.java:1621)
at com.atlassian.uwc.ui.ConverterEngine.writeHierarchy(ConverterEngine.java:1537)
at com.atlassian.uwc.ui.ConverterEngine.writeHierarchy(ConverterEngine.java:1485)
at com.atlassian.uwc.ui.ConverterEngine.convert(ConverterEngine.java:412)
at com.atlassian.uwc.ui.ConverterEngine.convert(ConverterEngine.java:210)
at com.atlassian.uwc.ui.UWCGuiModel.convert(UWCGuiModel.java:180)
at com.atlassian.uwc.ui.listeners.ConvertListener$Worker.construct(ConvertListener.java:277)
at com.atlassian.uwc.ui.SwingWorker$2.run(SwingWorker.java:110)
at java.lang.Thread.run(Thread.java:662)