To complete the installation of COREBlog - Restart Zope. This may be done from the Zope Control Panel. Do you upgrade from 0.70b or before? So, you should modify your blog to add a file rsd_xml (Really Simple Discoverablitiy). 1. In ZMI, open your blog and click contents tab. 2. Select blog_header object and add a line below: /rsd_xml" /> 3. Add 'rsd_xml' DTML Document 4. Copy into 'rsd_xml' from /your/Zope/Product-dir/COREBlog/dtml/rsd_xml.dtml