ClassNotFoundException under Tomcat

Hello Sir,
I am working on Tomcat4.1.24 and have jsp/servlet application running on it.
The directory structure of the application is,
1) created a folder "web" under the "webapps" folder.
2) web contains folders "include"(containing included jsp pages), "WEB_INF" and
all the jsp pages.
3) WEB_INF contains "classes"(containing servlet classes and beans),"lib"
folder containing Executable JAR files( like
classes12.jar,poolman.jar,log4j.jar,xerces and so on... )and the web.xml file.
Classes also contains folder "sl" which contains folder "servlet" ( contains
all the servlet classes)and "com".
The web.xml file contains all the Servlet Definitions and Servlet Mappings.for
eample ,
<servlet>
<servlet-name>AppSelectionServlet</servlet-name>
<servlet-class>com.servicelane.screens.AppSelectionServlet</servlet-class>
</servlet>

and

<servlet-mapping>
<servlet-name>AppSelectionServlet</servlet-name><url-
pattern>/sl/servlet/AppSelectionServlet</url-pattern>
</servlet-mapping>.....

I am using poolman.xml for connection pooling...and have made neccesary
configuration to the server.xml file regarding the Oracle driver and set the
Context path="/web" and docBase="web".
When i login into the application it gives me an "User ID or Password is not
found or is not valid".
And the error in the respective Log file is "ServletException:
ClassNotFoundException : AppSelectionServlet could not be found.....
The folder "sl" contains all the servlets but it is still not able to find that
servlet.
Prevoiusly i was able to Login to the application and was able to access the
next page to Login.jsp..but now i am not able to do so..

Can anybody help me out with this situation.Am i missing some settings or i am
going wrong somewhere...Any suggestions are greatly appreciated.
Thanks a million in advance.

Regards.

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