Article: Creating a Web Application with Ant and Tomcat 4 Subject: Build Failed ... Date: 2004-12-21 14:18:23 From: nt_yng Response to: Build Failed ... In your build.properties file make sure you double escape your path separators. C:\tomcat\common\lib should be C:\\tomcat\\common\\lib. That's why you didn't get a slash in the error message, Ant read it as an escape character.