Java Programming

I've been working on a project with other developers and we've all have our own sections of a large web application that we are working on. When we are each done working on our part we send our JSPs, Beans, and servlets to the lead developer that then deploys one EAR file on our Test/QA server. I now asked the tech lead if he could send me the EAR file so I can load the application in its entirety on my local machine. When I start up the server, I get the error "Failed to load servlet: java.lang.ClassNotFoundException" for each one of my servlets. Even if the servlet path is correct I still get that error. I also tried removing the servlet in the web.xml file and then adding it again, but I still get that error. Has anyone experienced anything like this before? Is this error appearing because I have two projects (my part of the application with only my code and the complete project from the EAR file) that point to the same servlets? I'm not sure how to resolve this. Any advice would be greatly appreciated. Thanks in advance!