Pb configuring WP to allow multisite

I am customizing my WP to allow multi site.
I am following the instructions from
Everything went fine until I modify the .htaccess file
At this stage, I am supposed to log in again.
There started the problem.
I received a database error.
It suggested to allow AUTO REPAIR in the wp-config.php file, which I did.
Then I received the following messages indicating that some tables were causing problem. Here is the message :

wp_1_posts: Table ‘namor302_wrdp1.wp_1_posts’ doesn’t exist
wp_1_comments: Table ‘namor302_wrdp1.wp_1_comments’ doesn’t exist
wp_1_links: Table ‘namor302_wrdp1.wp_1_links’ doesn’t exist
wp_1_options: Table ‘namor302_wrdp1.wp_1_options’ doesn’t exist
wp_1_postmeta: Table ‘namor302_wrdp1.wp_1_postmeta’ doesn’t exist
wp_1_terms: Table ‘namor302_wrdp1.wp_1_terms’ doesn’t exist
wp_1_term_taxonomy: Table ‘namor302_wrdp1.wp_1_term_taxonomy’ doesn’t exist
wp_1_term_relationships: Table ‘namor302_wrdp1.wp_1_term_relationships’ doesn’t exist
wp_1_commentmeta: Table ‘namor302_wrdp1.wp_1_commentmeta’ doesn’t exist

I would be grateful if someone could help me there.

I use Hostgator, and the cPanel is not accessible either: it gives a database error