Have you made any changes in the source tab of your project?
As we can see the last build was successful, but there are too many errors from yui-compressor.
We use forced by yui-compressor plugin minification for JS and CSS (Release builds). You need to use correct JS and CSS syntax for yui-compressor plugin. You can check compressing on http://refresh-sf.com/yui/ or any other external yui-compressor resources.