Trouble using Exerb

I’m having trouble using Exerb.

I’ve downloaded and installed from the main website, but everytime I
try to use either the console or gui version I get the following
errror:

C:\ruby\share\exerb>ruby181c.exc
default.rb:1: please replace an archive. (RuntimeError)

Any ideas?

RUBY_PLATFORM i386-mswin32
RUBY_RELEASE_DATE 2003-08-04
RUBY_VERSION 1.8.0