SQL & PL/SQL

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