Installation problems

Dear Group

Yesterday, I made a new installation of wyona using cvs. When I try to
open the unipublic sample publication I get the introduction page but
I get the error message posted below if I try to access "editor's view". 
As far as tested the other publications are ok. 

I run wyona on linux 2.4 (SuSE 7.3), using tomcat 4.1 as my servlet engine
and java version 1.3.1. 

At the moment, I have no idea how to fix this problem .....
Any help is appreciated 

Jann

Error message:

description
The server encountered an internal error () that prevented it from
fulfilling this request.

exception 

javax.servlet.ServletException: Servlet execution threw an exception
        at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Unknown
Source)
        at
org.apache.catalina.core.ApplicationFilterChain.doFilter(Unknown Source)
        at org.apache.catalina.core.StandardWrapperValve.invoke(Unknown
Source)
        at org.apache.catalina.core.StandardPipeline.invokeNext(Unknown
Source)
        at org.apache.catalina.core.StandardPipeline.invoke(Unknown
Source)
        at org.apache.catalina.core.ContainerBase.invoke(Unknown Source)
        at org.apache.catalina.core.StandardContextValve.invoke(Unknown
Source)
        at org.apache.catalina.core.StandardPipeline.invokeNext(Unknown
Source)
        at org.apache.catalina.core.StandardPipeline.invoke(Unknown
Source)
        at org.apache.catalina.core.ContainerBase.invoke(Unknown Source)
        at org.apache.catalina.core.StandardContext.invoke(Unknown Source)
        at org.apache.catalina.core.StandardHostValve.invoke(Unknown
Source)
        at org.apache.catalina.core.StandardPipeline.invokeNext(Unknown
Source)
        at org.apache.catalina.valves.ErrorDispatcherValve.invoke(Unknown
Source)
        at org.apache.catalina.core.StandardPipeline.invokeNext(Unknown
Source)
        at org.apache.catalina.valves.ErrorReportValve.invoke(Unknown
Source)
        at org.apache.catalina.core.StandardPipeline.invokeNext(Unknown
Source)
        at org.apache.catalina.valves.AccessLogValve.invoke(Unknown
Source)
        at org.apache.catalina.core.StandardPipeline.invokeNext(Unknown
Source)
        at org.apache.catalina.core.StandardPipeline.invoke(Unknown
Source)
        at org.apache.catalina.core.ContainerBase.invoke(Unknown Source)
        at org.apache.catalina.core.StandardEngineValve.invoke(Unknown
Source)
        at org.apache.catalina.core.StandardPipeline.invokeNext(Unknown
Source)
        at org.apache.catalina.core.StandardPipeline.invoke(Unknown
Source)
        at org.apache.catalina.core.ContainerBase.invoke(Unknown Source)
        at
org.apache.coyote.tomcat4.CoyoteProcessor.service(CoyoteProcessor.java:313)
        at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:331)
        at
org.apache.coyote.tomcat4.CoyoteProcessor.process(CoyoteProcessor.java:791)
        at
org.apache.coyote.tomcat4.CoyoteProcessor.run(CoyoteProcessor.java:870)
        at java.lang.Thread.run(Thread.java:484)

root cause 

java.lang.VerifyError: (class: org/wyona/xml/parser/XercesParser,
method: getDocument
signature: (Ljava/lang/String;)Lorg/w3c/dom/Document;) Incompatible object
argument for function call
        at java.lang.Class.forName0(Native Method)
        at java.lang.Class.forName(Class.java:120)
        at org.wyona.xml.DOMParserFactory.(DOMParserFactory.java:147)
        at org.wyona.xml.XPSAssembler.(XPSAssembler.java:80)
        at
org.wyona.cms.cocoon.transformation.IncludeTransformer.transform(IncludeTransformer.java:79)
        at
org.apache.cocoon.transformation.AbstractDOMTransformer.notify(AbstractDOMTransformer.java:175)
        at
org.apache.cocoon.xml.dom.DOMBuilder.notifyListener(DOMBuilder.java:203)
        at
org.apache.cocoon.xml.dom.DOMBuilder.endDocument(DOMBuilder.java:195)
        at
org.apache.cocoon.transformation.AbstractDOMTransformer.endDocument(AbstractDOMTransformer.java:203)
        at
org.apache.cocoon.sitemap.ContentAggregator.generate(ContentAggregator.java:157)
        at
org.apache.cocoon.components.pipeline.CachingEventPipeline.process(CachingEventPipeline.java:250)
        at
org.apache.cocoon.components.source.SitemapSource.toSAX(SitemapSource.java:351)
        at
org.apache.cocoon.generation.FileGenerator.generate(FileGenerator.java:142)
        at
org.apache.cocoon.components.pipeline.CachingEventPipeline.process(CachingEventPipeline.java:250)
        at
org.apache.cocoon.components.pipeline.CachingStreamPipeline.process(CachingStreamPipeline.java:399)
        at
org.apache.cocoon.components.treeprocessor.sitemap.SerializeNode.invoke(SerializeNode.java:153)
        at
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:85)
        at
org.apache.cocoon.components.treeprocessor.sitemap.PreparableMatchNode.access$2(PreparableMatchNode.java)
        at
org.apache.cocoon.components.treeprocessor.sitemap.PreparableMatchNode.invoke(PreparableMatchNode.java:156)
        at
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:109)
        at
org.apache.cocoon.components.treeprocessor.sitemap.PipelineNode.invoke(PipelineNode.java:140)
        at
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:109)
        at
org.apache.cocoon.components.treeprocessor.sitemap.PipelinesNode.invoke(PipelinesNode.java:144)
        at
org.apache.cocoon.components.treeprocessor.TreeProcessor.process(TreeProcessor.java:323)
        at
org.apache.cocoon.components.treeprocessor.TreeProcessor.process(TreeProcessor.java:293)
        at
org.apache.cocoon.components.treeprocessor.sitemap.MountNode.invoke(MountNode.java:131)
        at
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:85)
        at
org.apache.cocoon.components.treeprocessor.sitemap.PreparableMatchNode.access$2(PreparableMatchNode.java)
        at
org.apache.cocoon.components.treeprocessor.sitemap.PreparableMatchNode.invoke(PreparableMatchNode.java:156)
        at
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:85)
        at
org.apache.cocoon.components.treeprocessor.sitemap.ActTypeNode.access$4(ActTypeNode.java)
        at
org.apache.cocoon.components.treeprocessor.sitemap.ActTypeNode.invoke(ActTypeNode.java:150)
        at
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:85)
        at
org.apache.cocoon.components.treeprocessor.sitemap.PreparableMatchNode.access$2(PreparableMatchNode.java)
        at
org.apache.cocoon.components.treeprocessor.sitemap.PreparableMatchNode.invoke(PreparableMatchNode.java:156)
        at
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:109)
        at
org.apache.cocoon.components.treeprocessor.sitemap.PipelineNode.invoke(PipelineNode.java:140)
        at
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:109)
        at
org.apache.cocoon.components.treeprocessor.sitemap.PipelinesNode.invoke(PipelinesNode.java:144)
        at
org.apache.cocoon.components.treeprocessor.TreeProcessor.process(TreeProcessor.java:323)
        at
org.apache.cocoon.components.treeprocessor.TreeProcessor.process(TreeProcessor.java:293)
        at
org.apache.cocoon.components.treeprocessor.sitemap.MountNode.invoke(MountNode.java:131)
        at
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:85)
        at
org.apache.cocoon.components.treeprocessor.sitemap.PreparableMatchNode.access$2(PreparableMatchNode.java)
        at
org.apache.cocoon.components.treeprocessor.sitemap.PreparableMatchNode.invoke(PreparableMatchNode.java:156)
        at
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:109)
        at
org.apache.cocoon.components.treeprocessor.sitemap.PipelineNode.invoke(PipelineNode.java:140)
        at
org.apache.cocoon.components.treeprocessor.AbstractParentProcessingNode.invokeNodes(AbstractParentProcessingNode.java:109)
        at
org.apache.cocoon.components.treeprocessor.sitemap.PipelinesNode.invoke(PipelinesNode.java:144)
        at
org.apache.cocoon.components.treeprocessor.TreeProcessor.process(TreeProcessor.java:323)
        at
org.apache.cocoon.components.treeprocessor.TreeProcessor.process(TreeProcessor.java:293)
        at org.apache.cocoon.Cocoon.process(Cocoon.java:584)
        at
org.apache.cocoon.servlet.CocoonServlet.service(CocoonServlet.java:998)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
        at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Unknown
Source)
        at
org.apache.catalina.core.ApplicationFilterChain.doFilter(Unknown Source)
        at org.apache.catalina.core.StandardWrapperValve.invoke(Unknown
Source)
        at org.apache.catalina.core.StandardPipeline.invokeNext(Unknown
Source)
        at org.apache.catalina.core.StandardPipeline.invoke(Unknown
Source)
        at org.apache.catalina.core.ContainerBase.invoke(Unknown Source)
        at org.apache.catalina.core.StandardContextValve.invoke(Unknown
Source)
        at org.apache.catalina.core.StandardPipeline.invokeNext(Unknown
Source)
        at org.apache.catalina.core.StandardPipeline.invoke(Unknown
Source)
        at org.apache.catalina.core.ContainerBase.invoke(Unknown Source)
        at org.apache.catalina.core.StandardContext.invoke(Unknown Source)
        at org.apache.catalina.core.StandardHostValve.invoke(Unknown
Source)
        at org.apache.catalina.core.StandardPipeline.invokeNext(Unknown
Source)
        at org.apache.catalina.valves.ErrorDispatcherValve.invoke(Unknown
Source)
        at org.apache.catalina.core.StandardPipeline.invokeNext(Unknown
Source)
        at org.apache.catalina.valves.ErrorReportValve.invoke(Unknown
Source)
        at org.apache.catalina.core.StandardPipeline.invokeNext(Unknown
Source)
        at org.apache.catalina.valves.AccessLogValve.invoke(Unknown
Source)
        at org.apache.catalina.core.StandardPipeline.invokeNext(Unknown
Source)
        at org.apache.catalina.core.StandardPipeline.invoke(Unknown
Source)
        at org.apache.catalina.core.ContainerBase.invoke(Unknown Source)
        at org.apache.catalina.core.StandardEngineValve.invoke(Unknown
Source)
        at org.apache.catalina.core.StandardPipeline.invokeNext(Unknown
Source)
        at org.apache.catalina.core.StandardPipeline.invoke(Unknown
Source)
        at org.apache.catalina.core.ContainerBase.invoke(Unknown Source)
        at
org.apache.coyote.tomcat4.CoyoteProcessor.service(CoyoteProcessor.java:313)
        at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:331)
        at
org.apache.coyote.tomcat4.CoyoteProcessor.process(CoyoteProcessor.java:791)
        at
org.apache.coyote.tomcat4.CoyoteProcessor.run(CoyoteProcessor.java:870)
        at java.lang.Thread.run(Thread.java:484)