This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
The error should be obvious: there is no such file as D:\Android\junit\src\main\java\junit\runner\Version.java.template, yet you asked Ant to copy it. Did you get the file name correct? Did you get the directory name correct?
If that doesn't help, post the directory structure of your project and you build.xml file.