Error on a new instalation of biblio: table "biblio_contributor_data" has more than one primary key

PDOException : SQLSTATE[HY000]: General error: 1 table "biblio_contributor_data" has more than one primary key: CREATE TABLE {biblio_contributor_data} ( cid INTEGER PRIMARY KEY AUTOINCREMENT CHECK (cid>= 0), aka INTEGER NOT NULL CHECK (aka>= 0) DEFAULT 0, drupal_uid INTEGER NULL CHECK (drupal_uid>= 0) DEFAULT NULL, name VARCHAR(255) NOT NULL DEFAULT '', lastname VARCHAR(128) NOT NULL DEFAULT '', firstname VARCHAR(128) NULL DEFAULT '', prefix VARCHAR(128) NULL DEFAULT '', suffix VARCHAR(128) NULL DEFAULT '', initials VARCHAR(10) NULL DEFAULT '', affiliation VARCHAR(255) NULL DEFAULT '', literal INTEGER NOT NULL CHECK (literal>= 0) DEFAULT 0, md5 VARCHAR(32) NULL DEFAULT NULL, PRIMARY KEY (aka) ); ; Array ( ) dans db_create_table() (ligne 2657 dans /home/user/newsites.org/includes/database/database.inc).