What does it mean this error message?

ByteArrayInputStream@17494c8
at line 11 /web-app/servlet-mapping/
apache Tomcat/4.0.3


Follow some information

XP HOME

JAVA_HOME
C:\j2sdk1.4.1_01
J2EE_HOME
C:\j2sdkee1.3.1
CATALINA_HOME
C:\Programmi\Apache Tomcat 4.0

CLASSPATH
.;%JAVA_HOME%\lib\tools.jar;%J2EE_HOME%\lib\j2ee.jar;%CATALINA_HOME%
\common\lib\servlet.jar;%CATALINA_HOME%\lib\jasper-compiler.jar
Path
%SystemRoot%\system32;%SystemRoot%;%SystemRoot%\System32
\Wbem;C:\Programmi\ATI Technologies\ATI Control Panel;%JAVA_HOME%\bin


<?xml version="1.0" encoding="ISO-8859-1"?>

<!DOCTYPE web-app
PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd">

<web-app>
<servlet-mapping>
<servlet-name>hello</servlet-name>
<url-pattern>/servlet/*</url-pattern> </servlet-mapping>
//I HAVE NOT ANY DIR NAMED "SERVLET"

</web-app>