ORA-06550: line 6, column 31: PLS-00103:Encountered the symbol ")" - sql

Question

ORA-06550: line 6, column 31: PLS-00103: Encountered the symbol ")"
when expecting one of the following: (
I don't know how to manage error
create or replace PROCEDURE Get_StarInfo(Stars in out starsin.starname%type, cnt out integer, avg out float)
is
begin
select starname, count(title), avg(length) into Stars, cnt, avg
from starsin, movie
where movietitle=title
and movieyear=year
and starname=Stars
group by starname;
exception
when others then
cnt := -1;
avg := -1;
end;
declare
Stars starsin.starname%type := 'harrison ford';
cnt integer:=3;
avg float:=3.1;
begin
get_starinfo(Stars,cnt,avg);
end;

Answer 1

As Alex commented, it was a bad idea calling variable or parameter the same as built-in functions. Though, you can make it work but - you'd rather not do it that way.
I don't have your tables so I'm using Scott's sample schema, calculating some values from its emp table based on department number (that's your "stars").
SQL> create or replace PROCEDURE Get_StarInfo(Stars in out number, cnt out integer, avg out float)
2 is
3 begin
4 select deptno, count(*), avg(sal)/20 into Stars, cnt, avg
5 from emp
6 where deptno = stars
7 group by deptno;
8 exception
9 when others then
10 cnt := -1;
11 avg := -1;
12 end;
13 /
Procedure created.
This is how you called it and got the error:
SQL> set serveroutput on;
SQL> declare
2 Stars number := 10;
3 cnt integer; -- :=3;
4 avg float; -- :=3.1;
5 begin
6 get_starinfo(Stars,cnt,avg);
7 dbms_output.put_line('count = ' || cnt ||', average = ' || "AVG");
8 end;
9 /
get_starinfo(Stars,cnt,avg);
* --> see where the asterisk points to? That's where the error is!
ERROR at line 6:
ORA-06550: line 6, column 31:
PLS-00103: Encountered the symbol ")" when expecting one of the following:
(
ORA-06550: line 8, column 4:
PLS-00103: Encountered the symbol "end-of-file" when expecting one of the
following:
end not pragma final instantiable persistable order
overriding static member constructor map
SQL>
Now, how to use that "avg" of yours:
a side note: cnt and avg local variables (lines #3 and #4) are supposed to accept values returned by the procedure, so there's no point in setting their initial values
Oracle, by default, uses uppercase for object names, column names etc., so - if you enclose avg into double quotes and switch to uppercase (line #6), there's no error any more
So:
SQL> set serveroutput on;
SQL> declare
2 Stars number := 10;
3 cnt integer; -- :=3;
4 avg float; -- :=3.1;
5 begin
6 get_starinfo(Stars,cnt,"AVG");
7 dbms_output.put_line('count = ' || cnt ||', average = ' || "AVG");
8 end;
9 /
count = 3, average = 145.835
PL/SQL procedure successfully completed.
SQL>
Once again: as suggested, just don't do that. What we usually do, is to use prefix (such as v_ for "variable" or l_ for "local variable" or p_ for "parameter", etc.)