Hello,

It looks like the error message was truncated in your screenshot, so it doesn't include the path of the file that YUI compressor failed to process.

There's also likely a more specific error message about how it failed higher up in the build output.

Can you try rerunning the ant build, and pipe the output to a text file? You can then attach the full output with your reply.

http://stackoverflow.com/questions/6674327/redirect-all-output-to-file

Thanks,
Josh