Migration from B2evo to WP error

Hi,
I’ve a b2evo blog (2.4) and a fresh install of WP (2.3)
i want to migrate from B2 to WP
i’ve found a migration script : http://codex.wordpress.org/Importing_Content

But i’ve an error message :
“
No blogs returned from the b2evolution database! SELECT blog_ID,blog_name,blog_stub,blog_description,blog_shortname,blog_links_blog_ID FROM evo_blogs WHERE blog_ID IN (2) ORDER BY blog_ID
“

What can i do?

THx in advance,