OACLE判断表是否存在，如何生成新表？

declare IsTable  INTEGER:=0;
begin
select count(*) into IsTable from DBA_TABLES where table_name='NEDW_M_B_ADSL_D';
if IsTable=0 then
   create table NEDW_M_B_ADSL_D as
   select * from NEDW_M_B_ADSL_D@lnzd where rownum<=10;
else
   insert into NEDW_M_B_ADSL_D select * from NEDW_M_B_ADSL_D@lnzd where rownum<=10;
end if;
end;报错，
ORA-06550
PLS-00103 ：出现符号“crerate”在需要下列之一时......请问如何解决?