[opencms-dev] Error configuring application listener OpenCmsListener

[Fxl]

Hello!
Running tomcat on a debian sarge box, i'am trying to get OpenCms working.
The tomcat isnatllation works fine reffering to the examples, manage, doc
and other default stuff, but OpenCms doesn't:

2005-08-01 02:48:46 StandardContext[/opencms]: Error configuring application
listener of class org.opencms.main.OpenCmsListener
java.lang.NoClassDefFoundError: org/apache/log4j/helpers/Loader
        at org.opencms.main.CmsLog.<clinit>(CmsLog.java:91)
        at
org.opencms.main.OpenCmsListener.<clinit>(OpenCmsListener.java:60)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native
Method)
...

Installation context is:

ii  ant            1.6.2-2        Java based build tool like make
ii  j2re1.4        1.4.2.02-1     Blackdown Java(TM) 2 Runtime Environment,
St
ii  j2sdk1.4       1.4.2.02-1     Blackdown Java(TM) 2 SDK, Standard Edition
ii  java-common    0.22           Base of all Java packages
ii  jikes          1.22-2         Fast Java compiler adhering to language
and
ii  kaffe          1.1.5-3        A JVM to run Java bytecode
ii  kjc            1.1.4.PRECVS6- A compiler for the Java language written
in
ii  libant1.6-java 1.6.2-2.1      Java based build tool like make -- library
ii  libapache-mod- 1.2.5-2        Apache 1.3 connector for the Tomcat Java
ser
ii  libcommons-bea 1.6.1-4        utility for manipulating JavaBeans
ii  libcommons-dig 1.5.0.1-4      Rule based XML Java object mapping tool
ii  libcommons-mod 1.1-4          A convenience library to use Java
Management
ii  libgcj-common  3.3.5-13       Java runtime library (common files)
ii  libgcj4        3.3.5-13       Java runtime library for use with gcj
ii  libjaxp1.2-jav 1.2.01-1       Java XML parser and transformer APIs (DOM,
S
ii  liboro-java    2.0.8-3        Regular expression library for Java
ii  libregexp-java 1.3-1          regular expression library for Java
ii  libservlet2.3- 4.0-6          Servlet 2.3 and JSP 1.2 Java classes and
doc
ii  libstruts1.1-j 1.1-2          Java Framework for MVC web applications
ii  libtomcat4-jav 4.1.31-3       Java Servlet engine -- core libraries
ii  libxerces2-jav 2.6.2-2        Validating XML parser for Java with DOM
leve
ii  tomcat4        4.1.31-3       Java Servlet 2.3 engine with JSP 1.2
support
ii  tomcat4-admin  4.1.31-3       Java Servlet engine -- admin web
interfaces
ii  tomcat4-webapp 4.1.31-3       Java Servlet engine -- documentation and
exa
ii  liblog4j1.2-ja 1.2.9-1        Logging library for java

Any ideas? (i'am really only a java apprentice)

Greetings
fxl