为啥报错PLS-00905: 对象 HUARUI2016.PROCUSERATTENDANCE 无效

Question

CREATE OR REPLACE PROCEDURE  ProcUserAttendance    
 (Year  in NUMBER,
  Month in NUMBER)
IS
begin
 Delete From GateCard Where GCYear=iYear AND GCMonth=iMonth;
INSERT INTO GateCard (Userid,,GCYEAR,GCMONTH) 
        Values
       (
          (Select UserID, From tbUser
                             Where UserState=0
          ),
                             iYear,iMonth
       );
end;运行后报错如下：
ORA-06550: 第 2 行, 第 7 列: 
PLS-00905: 对象 HUARUI2016.PROCUSERATTENDANCE 无效
ORA-06550: 第 2 行, 第 7 列: 
PL/SQL: Statement ignored

Answer 1

INSERT INTO GateCard (Userid,,GCYEAR,GCMONTH) 
Userid ，后面写了两个逗号。 

Answer 2

直接写就OKINSERT INTO GateCard (Userid,GCYEAR,GCMONTH) 
Select UserID, iYear,iMonth From tbUser  Where UserState=0;