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I am trying to execute below PL SQL query

select m.*, n.region_building_count from 
(SELECT
  a.BUILDING_ID as "Building Id",
  d.Building_name as "Building Name",
  d.ADDRESS as "Building Address",
  d.REGION as "Region",
  d.Country as "Country",
  d.State as "State",
  d.City as "City"
FROM Company a, LOCATION d
where 1=1
and a.Building_ID like 'BLD-%') m
left JOIN
(select count(building_id) region_building_count, region from LOCATION l where l.Building_ID like 'BLD-%' group by region) n
on m.region = n.region

But keep getting error like

Oracle database error 904: ORA-00904: "M"."REGION": invalid identifier 

Any idea what I am missing

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