I had a similar problem
I found these repos to work


770 OS2006:
Add the following repository to your Application Catalog:

http://openbossa.indt.org.br/canola1/repository/770
distribution: mistral
component: user

770 Hacker Edition:
Add the following repository to your Application Catalog:

http://openbossa.indt.org.br/canola1/repository/bora
distribution: bora
component: user



you have to make sure you have removed/disabled the old openbossa.indt.org.br repo


If this does not work, what OS are you using?