install request

Usually this occurs when (1) WordPress can access the database but (2) is not finding any tables for the table prefix as specified in wp-config.php.

So, check wp-config.php to find out what table prefix you’ve specified and then use phpmyadmin to look at your database to see if you have *any* wordpress-related tables and if they’re using the prefix as specified in wp-config.php

Yesterday the website works pefectly, and I’ve changed nothing.

However in wp_config.php the table prefix is set to “aca_”,
and in phpMyAdmin all the tables started with “aca_”

If you install this script, what does it tell you?

https://gist.github.com/sivel/162913

It gives all this errors:

"Connected successfully to the MySQL server
Database selected successfully

Checking tables for errors:

The table colombe-wordpress.aca_commentmeta is NOT OK. Error: Unknown storage engine 'InnoDB'
Not repairing table colombe-wordpress.aca_commentmeta due to configuration.
Change $allow_repair to true or define WP_ALLOW_REPAIR in wp-config.php

The table colombe-wordpress.aca_comments is NOT OK. Error: Unknown storage engine 'InnoDB'
Not repairing table colombe-wordpress.aca_comments due to configuration.
Change $allow_repair to true or define WP_ALLOW_REPAIR in wp-config.php

The table colombe-wordpress.aca_links is NOT OK. Error: Unknown storage engine 'InnoDB'
Not repairing table colombe-wordpress.aca_links due to configuration.
Change $allow_repair to true or define WP_ALLOW_REPAIR in wp-config.php

The table colombe-wordpress.aca_mc_forms is OK

The table colombe-wordpress.aca_options is NOT OK. Error: Unknown storage engine 'InnoDB'
Not repairing table colombe-wordpress.aca_options due to configuration.
Change $allow_repair to true or define WP_ALLOW_REPAIR in wp-config.php

The table colombe-wordpress.aca_postmeta is NOT OK. Error: Unknown storage engine 'InnoDB'
Not repairing table colombe-wordpress.aca_postmeta due to configuration.
Change $allow_repair to true or define WP_ALLOW_REPAIR in wp-config.php

The table colombe-wordpress.aca_posts is NOT OK. Error: Unknown storage engine 'InnoDB'
Not repairing table colombe-wordpress.aca_posts due to configuration.
Change $allow_repair to true or define WP_ALLOW_REPAIR in wp-config.php

The table colombe-wordpress.aca_revslider_css is NOT OK. Error: Unknown storage engine 'InnoDB'
Not repairing table colombe-wordpress.aca_revslider_css due to configuration.
Change $allow_repair to true or define WP_ALLOW_REPAIR in wp-config.php

The table colombe-wordpress.aca_revslider_layer_animations is NOT OK. Error: Unknown storage engine 'InnoDB'
Not repairing table colombe-wordpress.aca_revslider_layer_animations due to configuration.
Change $allow_repair to true or define WP_ALLOW_REPAIR in wp-config.php

The table colombe-wordpress.aca_revslider_navigations is NOT OK. Error: Unknown storage engine 'InnoDB'
Not repairing table colombe-wordpress.aca_revslider_navigations due to configuration.
Change $allow_repair to true or define WP_ALLOW_REPAIR in wp-config.php

The table colombe-wordpress.aca_revslider_sliders is NOT OK. Error: Unknown storage engine 'InnoDB'
Not repairing table colombe-wordpress.aca_revslider_sliders due to configuration.
Change $allow_repair to true or define WP_ALLOW_REPAIR in wp-config.php

The table colombe-wordpress.aca_revslider_slides is NOT OK. Error: Unknown storage engine 'InnoDB'
Not repairing table colombe-wordpress.aca_revslider_slides due to configuration.
Change $allow_repair to true or define WP_ALLOW_REPAIR in wp-config.php

The table colombe-wordpress.aca_revslider_static_slides is NOT OK. Error: Unknown storage engine 'InnoDB'
Not repairing table colombe-wordpress.aca_revslider_static_slides due to configuration.
Change $allow_repair to true or define WP_ALLOW_REPAIR in wp-config.php

The table colombe-wordpress.aca_term_relationships is NOT OK. Error: Unknown storage engine 'InnoDB'
Not repairing table colombe-wordpress.aca_term_relationships due to configuration.
Change $allow_repair to true or define WP_ALLOW_REPAIR in wp-config.php

The table colombe-wordpress.aca_term_taxonomy is NOT OK. Error: Unknown storage engine 'InnoDB'
Not repairing table colombe-wordpress.aca_term_taxonomy due to configuration.
Change $allow_repair to true or define WP_ALLOW_REPAIR in wp-config.php

The table colombe-wordpress.aca_termmeta is NOT OK. Error: Unknown storage engine 'InnoDB'
Not repairing table colombe-wordpress.aca_termmeta due to configuration.
Change $allow_repair to true or define WP_ALLOW_REPAIR in wp-config.php

The table colombe-wordpress.aca_terms is NOT OK. Error: Unknown storage engine 'InnoDB'
Not repairing table colombe-wordpress.aca_terms due to configuration.
Change $allow_repair to true or define WP_ALLOW_REPAIR in wp-config.php

The table colombe-wordpress.aca_usermeta is NOT OK. Error: Unknown storage engine 'InnoDB'
Not repairing table colombe-wordpress.aca_usermeta due to configuration.
Change $allow_repair to true or define WP_ALLOW_REPAIR in wp-config.php

The table colombe-wordpress.aca_users is NOT OK. Error: Unknown storage engine 'InnoDB'
Not repairing table colombe-wordpress.aca_users due to configuration.
Change $allow_repair to true or define WP_ALLOW_REPAIR in wp-config.php

The table colombe-wordpress.aca_word_replacer is OK"

But I can’t understand why, I didn’t touched anything in phpMyAdmin!
What I’ve to do?

Here’s the key phrase: error: Unknown storage engine

Your host may have disabled the InnoDB storage engine in the database server. Contact your host’s tech support and ask them “What happened to InnoDB? It was working the other day.”

Thank you, I’ve contacted the host support!