I was creating multi partitioned external table received error

Hello Tom i was creating multi partitioned external table from parquet file but end up having these error did so much research but not able find cause of this error please see below code and help me

my query 

BEGIN

DBMS_CLOUD.CREATE_EXTERNAL_PART_TABLE (

  table_name    => 'mysales',

  credential_name  => 'DEF_CRED', 

   file_uri_list     =>  'https://objectstorage.us-ashburn-1.oraclecloud.com/n/idrzqj5ugpca/b/warehousedatastandard/o/SALES/*.parquet',

  format      => 

   json_object(  'type' value 'parquet', 

        'schema' value 'first',

     'partition_columns' value 

      json_array(

       json_object('name' value 'REGION', 'type' value 'varchar2(300)'),

       json_object('name' value 'COUNTRY', 'type' value 'varchar2(300)')