sendmail xsl problem

hi all

When I run the sendmail logicsheet I get a problem with the transformation of sendmail.xsl..

original message:
org.apache.cocoon.ProcessingException: Language Exception: org.apache.cocoon.components.language.LanguageException: Error compiling sendmail_xsp: Line 139, column 32: method valueOf() not found in class java.lang.String Line 140, column 57: method valueOf() not found in class java.lang.String Line 157, column 42: method valueOf() not found in class java.lang.String Line 158, column 39: method valueOf() not found in class java.lang.String Line 0, column 0: 4 errors 

i´m using:

win2k, tomcat 4.0.1, cocoon 2.0.2-dev, jdk 1.3.1, javamail-1.2, jaf-1.0.1

thanks
oliver