This is caused by the compression method for the bliss JAR file. bliss uses something called Pack200 to keep the file size as small as possible.
You're probably trying to install using an incompatible version of Java. bliss requires Java version 1.6 or later. The only workaround, currently, is to install Java 1.6 or later.
Any other FAQs I forgot or clarifications required? Post your ideas below!