oracle存储过程的问题

我现在有一个存储过程
CREATE OR REPLACE Procedure p_insert_tb_user 
(
id in Number,
name in Nvarchar2,
pwd in Nvarchar2
)
as
BEGIN
insert into tb_users values (id,name,pwd);
commit;
End;

我的id是自增序列，我在调用的时候写exec p_insert_tb_user(null,'admin','admin')会报错，写exec p_insert_tb_user(userIdentity.nextval,'admin','admin')也会报错，请问应该要怎么写id这列的值呢？谢谢各位了！

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什么错啊？？？

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null的时候报：无法将 NULL 插入
userIdentity.nextval的时候报：在此上下文中不允许表，视图或序列引用 'userIdentity.NEXTVAL'

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id没有插入，写个单独过程调用生成id,然后在插入

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存储过程改一下，参数不能使用序列
SQL code:
CREATE OR REPLACE PROCEDURE p_insert_tb_user(NAME IN NVARCHAR2, pwd IN NVARCHAR2) AS
BEGIN
INSERT INTO tb_users VALUES (userIdentity.nextval, NAME, pwd);
COMMIT;
END;

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1:
declare
v_id number;
begin
select userIdentity.nextval into v_id from dual;
exec p_insert_tb_user(v_id,'admin','admin')
end;
2:
修改存储过程如下:
CREATE OR REPLACE Procedure p_insert_tb_user  
(
name in Nvarchar2,
pwd in Nvarchar2
)
as
BEGIN
insert into tb_users values (userIdentity.nextval ,name,pwd);
commit;
End;

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SQL code

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