“PDOException: SQLState [HY093]: Ungültiger Parameter taub” Code-Antworten

PDOException: SQLState [HY093]: Ungültiger Parameter taub

$stm->execute(
    array(":user_id" => $user_id, 
          ":hash" => $hash, 
          ":expire" => $future,
          ":hash2" => $hash)
);