Um erro no Banco de Dados aconteceu

Error Number:

ERROR: column "exibir" does not exist LINE 6: AND EXTRACT(MONTH FROM data_inicio) = exibir ^

SELECT * FROM "evento" WHERE "id_portal" = '1' AND "ativo" = 1 AND "rascunho" = 0 AND EXTRACT(MONTH FROM data_inicio) = exibir AND EXTRACT(YEAR FROM data_inicio) = pagina

Filename: /home/web11/application/models/evento_m.php

Line Number: 51