It might be due to that your EJS was old version and you installed java with newer version.
Please go to http://www.um.es/fem/EjsWiki/Main/Download
and download latest version ejs
Then, open your files with latest version EJS. I think it might solve the problem.
Normally, I create workspace under root e.g. c:\workspace instead under ejs installed directory.
Then, you do not need to move source file from one version to another version.