JNI panic: JNI received a null string

[Andrés Padilla]

i have just intalled my cocoon 2 with tomcat 3.X, following all the steps form de installing document and when i type in my browser: localhost:8080/cocoon tomcat fails throwing this menssage: any idea?

JNI panic: JNI received a null string
        at java.lang.ClassLoader.findLoadedClass(Native Method)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:280)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
        at org.apache.avalon.excalibur.component.ExcaliburComponentManager.lookup(Unknown Source)
        at org.apache.avalon.excalibur.component.ExcaliburComponentManager.lookup(Unknown Source)
        at org.apache.cocoon.sitemap.AbstractSitemap.compose(AbstractSitemap.java:122)
        at org.apache.avalon.excalibur.component.DefaultComponentFactory.newInstance(Unknown Source)
        at org.apache.avalon.excalibur.component.ThreadSafeComponentHandler.initialize(Unknown Source)
        at org.apache.cocoon.components.language.generator.GeneratorSelector.addGenerator(GeneratorSelector.java:143)
        at org.apache.cocoon.components.language.generator.ProgramGeneratorImpl.addCompiledComponent(ProgramGeneratorImpl.java:348)
        at org.apache.cocoon.components.language.generator.ProgramGeneratorImpl.load(ProgramGeneratorImpl.java:183)
        at org.apache.cocoon.sitemap.Handler.run(Handler.java:208)
        at java.lang.Thread.run(Thread.java:484)