Error scraping for rman_backup_status : No metrics found while parsing source=main.go:188 about oracledb_exporter HOT 8 CLOSED

[[metric]]
context = "rman_backup_status"
labels = [ "start_time", "input_type" ]
metricsdesc = { value="Gauge metric with rman backup status (5:FAILED; 4:RUNNING WITH ERRORS; 3:COMPLETED WITH ERRORS; 2:RUNNING WITH WARNINGS; 1:COMPLETED WITH WARNINGS; 0:COMPLETED)." }
request = "SELECT to_char(start_time, 'yyyy-mm-dd hh24:mi:ss') as start_time, input_type, status as value FROM v$rman_backup_job_details WHERE start_time = (SELECT max(start_time) FROM v$rman_backup_job_details)"

SELECT
  to_char(start_time, 'yyyy-mm-dd hh24:mi:ss') as start_time, input_type, status as value
FROM
  v$rman_backup_job_details
WHERE
  start_time = (SELECT max(start_time) FROM v$rman_backup_job_details)

[[metric]]
context = "rman_backup_status"
labels = [ "start_time", "input_type" ]
metricsdesc = { value="Gauge metric with rman backup status (5:FAILED; 4:RUNNING WITH ERRORS; 3:COMPLETED WITH ERRORS; 2:RUNNING WITH WARNINGS; 1:COMPLETED WITH WARNINGS; 0:COMPLETED)." }
request = '''
SELECT to_char(start_time, 'yyyy-mm-dd hh24:mi:ss') as start_time
,      input_type
,      cast( decode(status, 'FAILED', 5, 'RUNNING WITH ERRORS', 4, 'COMPLETED WITH ERRORS', 3, 'RUNNING WITH WARNINGS', 2, 'COMPLETED WITH WARNINGS', 1, 0) as integer) as value 
FROM v$rman_backup_job_details 
WHERE start_time = (SELECT max(start_time) FROM v$rman_backup_job_details)
'''

# HELP oracledb_rman_backup_status_value Gauge metric with rman backup status (5:FAILED; 4:RUNNING WITH ERRORS; 3:COMPLETED WITH ERRORS; 2:RUNNING WITH WARNINGS; 1:COMPLETED WITH WARNINGS; 0:COMPLETED).
# TYPE oracledb_rman_backup_status_value gauge
oracledb_rman_backup_status_value{input_type="DB FULL",start_time="2019-09-12 09:48:43"} 5