为什么我在执行这个脚本时遇到这个错误（plsql oracle）

我正在编写plsql脚本，并且当我使用ROW_NUMBER（）OVER（PARTITION BY ...：这是给我这个错误我的代码行：不一致的数据类型：预期 - 有CLOB为什么我在执行这个脚本时遇到这个错误（plsql oracle）

这是我的代码：

CREATE OR REPLACE VIEW "VW_APP_PU_LOCATION_CLUSTER" ("ID", "BATCH_ID", "PRODUCTION_SYSTEM_ID", "CODE", "URGENCY", "CURRENT_STATE", "VALUE", "ELEMENT_ID","VIEW_ID") AS 
    SELECT app.id AS id 
    ,  app.batch_state AS batch_id 
    ,  app.production_system_id AS production_system_id 
    ,  atp.code AS code 
    ,  app.urgency_code AS urgency 
    ,  app.current_state AS current_state 
    ,  dbms_lob.substr(el.value, 4000, 1) AS value 
    ,  el.element_id AS element_id 
    , ROW_NUMBER() OVER (PARTITION BY LOWER(el.value) ORDER BY loc.code) AS view_id  
    FROM application app 
    CROSS JOIN application_type atp 
    CROSS JOIN location loc 
    CROSS JOIN application_order ord 
    LEFT JOIN data_element el ON (app.id = el.application_id AND el.element_id = isexistsparam('Pu Generation','SORTING_DATA_ELEMENT')) 
    WHERE app.application_type_id = atp.id 
    AND app.location_id = loc.id 
    AND app.application_order_id = ord.id 
    AND app.current_state in 
    (
     select distinct sd.state 
     from process_state_definition psd, 
     state_definition sd, 
     application_type appType, 
     application appli, 
     process_definition pd 
     Where 
     ((appType.code is null)or (appType.id = appli.application_type_id AND sd.id = psd.state_definition_id) 
     AND psd.application_type_id = appType.id 
     AND psd.process_definition_id = pd.id 
     AND psd.state_type='START' 
     AND pd.name = 'Pu Generation') 
    )  
    ORDER BY loc.code asc, 
CASE WHEN isexistsparam('Pu Generation', 'SORTING_DATA_ELEMENT') != -1 
THEN dbms_lob.substr(el.value, 4000, 1) ELSE NULL 
END 
    ,  ord.date_ordered asc 
    ,  app.application_number asc;