Hello to the community.

suddenly i have this problem, when i make login on the site i have this error :

PDOException: SQLSTATE[42S02]: Base table or view not found: 1146 Table 'm91515d1.field_data_' doesn't exist: SELECT n.nid AS nid, n.title AS title FROM {node} n INNER JOIN {field_data_} f ON n.vid = f.revision_id WHERE (f._uid = :db_condition_placeholder_0) AND (n.status = :db_condition_placeholder_1) AND ( EXISTS (SELECT na.nid AS nid FROM {node_access} na WHERE (( (na.gid = :db_condition_placeholder_2) AND (na.realm = :db_condition_placeholder_3) )OR( (na.gid = :db_condition_placeholder_4) AND (na.realm = :db_condition_placeholder_5) )OR( (na.gid = :db_condition_placeholder_6) AND (na.realm = :db_condition_placeholder_7) ))AND (na.grant_view >= :db_condition_placeholder_8) AND (n.nid = na.nid) )) ; Array ( [:db_condition_placeholder_0] => 1 [:db_condition_placeholder_1] => 1 [:db_condition_placeholder_2] => 0 [:db_condition_placeholder_3] => all [:db_condition_placeholder_4] => 0 [:db_condition_placeholder_5] => content_access_author [:db_condition_placeholder_6] => 1 [:db_condition_placeholder_7] => content_access_rid [:db_condition_placeholder_8] => 1 ) in station_schedule_user_load() (linea 585 di /home/asdares2009.it/public_html/sites/all/modules/station/schedule/station_schedule.module).

i don't know what i can do, and it is very bad for me because nodoby can make login, i'm the administrator and i can't enter, so i can't do anuthing.

please can you help me?