表或视图不存在

您好，以下是我的代码 . 我需要使用视图中的数据创建一个视图并在另一个游标中获取数据 . 但是当我执行我的代码时，我收到错误

“ORA-06550：第56行，第37列：PL / SQL：ORA-00942：表或视图不存在ORA-06550：第52行，第9列：PL / SQL：忽略SQL语句”

这是什么问题？提前致谢 .

declare

drop_view_sql varchar2(100) := 'drop view rv_task_number_view';

type tasks_rec is record(task_number varchar2(20));

type t_tab is table of  tasks_rec;

tasks_tab t_tab;

notes_rec xx_fs_mob_loc_rec.task_notes_rec;

notes_tab xx_fs_mob_loc_rec.task_notes_tab;

    begin

        execute immediate 'create view apps.rv_task_number_view  as
                          SELECT distinct ct.task_number                  
                          FROM csf_ct_tasks ct ,

                            cs_estimate_details ced,
                            csf_debrief_headers cdh,
                            csf_debrief_lines   cdl,
                            jtf_task_assignments jta  

                   WHERE    1=1
                   and      jta.task_id = ct.task_id
                   and      jta.task_assignment_id = cdh.task_assignment_id(+)
                   and      cdh.debrief_header_id = cdl.debrief_header_id(+)
                   and      cdl.debrief_line_id = ced.source_id(+)
                   AND      ((ct.planned_end_date between (sysdate-30) and (sysdate+30)) or (ct.scheduled_end_date between (sysdate-30) and (sysdate+30)))
                   and      jta.resource_id = 10153';

              execute immediate     'grant select on apps.rv_task_number_view to apps';

        DBMS_OUTPUT.PUT_LINE(sqlerrm);

        declare

        CURSOR c2 is

        SELECT ct.task_id,jtf_note_id,  jnv.notes,
               jnv.creation_date,jnv.last_update_date
            FROM
               jtf_notes_vl jnv,
               csf_ct_tasks ct,apps.rv_task_number_view rvt
            WHERE
                jnv.source_object_code = 'TASK' 
                and ct.task_number = jnv.source_number
                and ct.task_number = rvt.task_number
                order by task_id, jtf_note_id;

        begin

        open c2;

        fetch c2 bulk collect into notes_tab;

        DBMS_OUTPUT.PUT_LINE(sqlerrm);

        end;

        execute immediate drop_view_sql;

        DBMS_OUTPUT.PUT_LINE(sqlerrm);

    END;