ORA-00932: inconsistent datatypes: expected CHAR got LONG

select
   view_name,
   owner,
   substr(text, 5, 10) t_5_10
from
   dba_views;
--
-- --> ORA-00932: inconsistent datatypes: expected CHAR got LONG
--

select
   obj.name  view_name,
   own.name  owner,
   substr(to_clob(DBMS_DUMA_INTERNAL.READ_LONG_TO_BLOB('SYS', 'VIEW$', 'TEXT', viw.rowid)), 5, 10) t_5_10
from
   sys."_CURRENT_EDITION_OBJ" obj                           join
   sys.view$                  viw on obj.obj# = viw.obj#    join
   sys.user$                  own on obj.owner# = own.user#
;