Error "org.apache.commons.logging package does not exist" appeared

I transferred my web application (Force.com platform REST API) developed in NetBeans to a remote Tomcat server (copied the war file in webapps folder through pscp). It ran for the first time fine but since then it has been given my an error in the logging package. I am not able to edit the HTTPClient.java file where this package is imported. I have added the "commons-httpclient-3.1.jar" library to my project where the HttpClient.java is also defined. Now, I am getting the attached error when I try to run my application.

How can I fix this?

Attachment 1623

Thanks!

May/may not be related, but see Commons Logging - Troubleshooting Guide in particular the Apache Tomcat notice

Did not work.I am a little confused with this. Can I edit the httpclient.class file where this package is imported, maybe delete it? Right now, I am not able to edit it. I tried importing a new library but after first run, the same error appeared again.