Problem configuring tomcat with Apache

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Hi,

I am trying to configure Tomcat for Apache on iSeries V5R1 but it
seems more difficult than I expected.
It is quite easy to create an Apache server and the system I work on
has the latest appropriate PTF (SF99156).
However, when I follow the standard guidelines that the relevant
literature provides (configuring via the GUI from
http://servername:2001/HTTPAdmin[1] ) I get error messages:
1. After selecting my http server I choose /Basic ASF Tomcat
Wizard/ and from the screen that appears I click next.
Then, a long java class exception message appears:
Error: 500
Location: /HTTPAdmin/Frame/tc.taskIpBasic/NIKSERVER1/Next
Internal Servlet Error:
java.lang.NoClassDefFoundError:
org/apache/xerces/parsers/DOMParser
java/lang/Throwable.(Ljava/lang/String;)V+4 (Throwable.java:94)
  com/ibm/as400/httpsvr/data/DOMParser.()V+0 (DOMParser.java:93)

  com/ibm/as400/httpsvr/data/XMLFile.read(Ljava/lang/String;)Z+0
    (XMLFile.java:114)
  com/ibm/as400/httpsvr/data/ServerXML.read(Ljava/lang/String;)Z+ 0
ServerXML.java:69)... ..
      etc.
..where NIKSERVER1 is the name of my http server. Up to this
point, I cannot see anywhere an option to install JSP samples.

2. The same thing happens when I use the /ASF Tomcat Setup task/ link
instead of Basic ASF Tomcat Wizard. After choosing /Enable
servlets../ from the first screen, the Java version and the process
(in or out-process, without changing anything in the java classpath
entries) and clicking next from this second screen, I get the same
error message as before.

I ´ve also downloaded tomcat 4.0.4, istall and run it as a
standalone servlet engine on iSeries, and it is OK (not configured though)

Please, can anybody help?
Thanks in advance
Nick

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===References:===
  1. http://servername:2001/HTTPAdmin
  2. http://g.msn.com/1HM1ENXX/c156??PI=31901