tomcat startup error

[t.n.a.]

I'm using eclipse and sysdeo. I attempted to make a small prototype 
application, but I can't get tomcat to start.
This is what tomcat says when I try:

SEVERE: Error deploying configuration descriptor klapa9.xml
java.lang.NoClassDefFoundError: org/apache/log4j/Layout
klapa9.xml looks like this:
<Context path="/klapa9" docBase="D:/posao/klapa9/context" debug="6"/>
My project is obviously in D:/posao/klapa9/.
I started with tomcat 5.5.7 as well as 5.0.28 and got nowhere. Any ideas 
what I'm doing wrong?

Tomislav
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