But now, it is no longer working , I checked the column added on snowflake and they are not there. It is then retunrin the following message.

Database Error in model AD_UNIT_PER_REFERRER_REPORT_STREAM_SCD (models/generated/airbyte_incremental/scd/GOOGLE_AD_MANAGER/AD_UNIT_PER_REFERRER_REPORT_STREAM_SCD.sql)
  000904 (42000): SQL compilation error: error line 36 at position 31
  invalid identifier 'AD_UNIT_ID'