ORA-01423: error encountered while checking for extra rows in exact fetch

Question

ERROR at line 1:
ORA-01423: error encountered while checking for extra rows in exact fetch
ORA-01722: invalid number
ORA-06512: at "Department.get_emp_name", line 57
ORA-06512: at line 14
Hi
The above are the error messages I am running into and I am not sure what it means at all. I do have a query which select few rows into cursor
cursor c_requested is
select * from departments where emp_id in (1, 2, 3)
now from these rows I again creating a query dynamically
open c_requested;
loop
fetch c_requested into deptID, name, authorized; -- declared variables
exit when c_requested%NotFound;
sqlstring := 'Select name from employees where deptID = ' || deptID || ' and Authorized = ' || authorized;
begin
execute immediate sqlstring into description; -- declared variable
exit;
exception when no_data_found then
description := 'FILTER_OUT';
end;
end loop;
close c_requested;
This code is inside a function get_emp_name(). When I execute this function I am getting the above errors. I really appreciate all your help. Please let me know if you need more information.
Thank you very much

Answer 1

Thank you very much damorgan,
I looked through my code and figured out what was wrong. I had a varchar2 column in the table where I was passing a value 999 instead of '999'. Thanks again.
I have one more question. I am using cursor to loop through.. here is my code
rowcount integer;
cursor c_emp is
select * from employees where empID in (....);
begin
open c_emp;
rowcount := c_emp%RowCount;
loop
end loop;
dbms_output.put_line(rowcount);
end;
I am getting rowcount = 0 even though there are many values in it. I am not sure if I am using the where clause properly. Any help would be appreciated.
thank you.