Problem with Bi Publisher Bursting

https://ecuo.bi.us2.oraclecloud.com/xmlpserver/help/en/htmfiles/bipoh/add_burst_def.htm#BABJGEJA) but when i try to send an email with the report result on TXT format the job send me the error:

"Output failed.

[INSTANCE_ID=cffar41070i04.usdc2.oraclecloud.com.1495272764164] [SUBJOB_ID=11143] Invalid format requested: text"

I use the next query on the bursting:

SELECT 1 as "KEY",

  'AUX_CUENTAS2_REP' AS "TEMPLATE",

  'en-US' AS "LOCALE",

  'txt' AS "OUTPUT_FORMAT,

  'file' AS "OUTPUT_NAME",

  'EMAIL' AS "DEL_CHANNEL",

  'mail1@oracle.mx' AS "PARAMETER1",

  NULL AS "PARAMETER2",

  'mail2@oracle.mx' AS "PARAMETER3",

  'xxxxxxx' AS "PARAMETER4",

  'xxxxxxx' AS "PARAMETER5",