PL / SQL：ORA-22905：无法访问非嵌套表项的行

Question

我在包中声明了一个嵌套的表类型，所以不要理解我在这里收到的错误。

CREATE OR REPLACE PACKAGE model_collection_types
IS                                                    
  TYPE project_sk_list IS TABLE OF dw_dim_project.project_sk%TYPE;

END model_collection_types;
/

DECLARE      
  drug_projects model_collection_types.project_sk_list;

  CURSOR c1 IS
    SELECT a.project_sk
    FROM dw_dim_project a 
    INNER JOIN dw_dim_program b ON a.program_sk = b.program_sk
    WHERE a.status_cd = 1
          AND b.program_category_desc = 'DRUG'
          AND a.state = 'ACTIVE';

BEGIN
  OPEN c1;
  FETCH c1 BULK COLLECT INTO drug_projects;
  CLOSE c1;

  dbms_output.put_line(drug_projects.count || ' projects insertred into drug_projects table');

  FOR l_row IN drug_projects.first .. drug_projects.last
  LOOP
    dbms_output.put_line('Project_SK : ' || l_row || ' ' || drug_projects(l_row));
  END LOOP;

  SELECT column_value
    FROM TABLE (drug_projects) c;
END;
/

任何建议表示赞赏，我也尝试了SELECT * FROM COLUMN_VALUE FROM TABLE(drug_projects)。