'publishing to glassfish 4.0 at localhost...' has encountered a prblem. cannot deploy SocialNetwork

cannot Deploy SocialNetwork deploy is failing=Error occurred during deployment: Exception while deploying the app [SocialNetwork] : Servlet [Update_ansServ] and Servlet [SocialNetwork.servlet.Update_ansServ] have the same url pattern: [/Update_ansServ]. Related annotation information: annotation [@javax.servlet.annotation.WebServlet(loadOnStartup=-1, initParams=[], urlPatterns=[], displayName=, name=, largeIcon=, description=, asyncSupported=false, smallIcon=, value=[/Update_ansServ])] on annotated element [class SocialNetwork.servlet.Update_ansServ] of type [TYPE]. Please see server.log for more details.