wp 3.0 multiple sites – the tables were not created

I’m with these errors… I created a blog on my “wp 3.0 multiple sites” and the tables were not created. anyone know why?

wp_3_posts: Table ‘dominios_andrea.wp_3_posts’ doesn’t exist
wp_3_comments: Table ‘dominios_andrea.wp_3_comments’ doesn’t exist
wp_3_links: Table ‘dominios_andrea.wp_3_links’ doesn’t exist
wp_3_options: Table ‘dominios_andrea.wp_3_options’ doesn’t exist
wp_3_postmeta: Table ‘dominios_andrea.wp_3_postmeta’ doesn’t exist
wp_3_terms: Table ‘dominios_andrea.wp_3_terms’ doesn’t exist
wp_3_term_taxonomy: Table ‘dominios_andrea.wp_3_term_taxonomy’ doesn’t exist
wp_3_term_relationships: Table ‘dominios_andrea.wp_3_term_relationships’ doesn’t exist
wp_3_commentmeta: Table ‘dominios_andrea.wp_3_commentmeta’ doesn’t exist

thanks