创建触发器时出现 PLS-00049: 错误的赋值变量 ':NEW.land_name'

create or replace trigger t_hang_info
before insert or update or delete on hang_info
for each row
declare
pbCount number;
begin
select count(LANDID) into pbCount from TRADECENTER_LANDHANG where LANDID = :new.land_no;
if inserting or updating then
if pbCount<=0 then
insert into TRADECENTER_LANDHANG (
INFORID,
LANDID,
LANDNAME,
STARTTIME,
ENDTIME,
HIGHESTPRICE,
INCPRICE
) values (
:new.hang_no,
:new.land_no,
:new.land_name,
:new.hang_start_date,
:new.hang_end_date,
:new.hang_start_price,
:new.hang_inc_price
);
else
update TRADECENTER_LANDHANG set
INFORID = :new.hang_no,
LANDID = :new.land_no,
LANDNAME = :new.land_name,
STARTTIME = :new.hang_start_date,
ENDTIME = :new.hang_end_date,
--HIGHESTPRICE = :new.hang_start_price,
INCPRICE = :new.hang_inc_price
where landid = :new.land_no;
end if;
end if;
if deleting then
delete from TRADECENTER_LANDHANG where landid = :old.land_no;
end if;
end;

两个带颜色的地方报错

PLS-00049: 错误的赋值变量 ':new.land_name'

PLS-00049: 错误的赋值变量 ':new.land_name'

检查表结构后发现是我已经把land_name字段总表hang_info中删除了，所以造成这样的错误，加上之后就测试通过了。