PLSQL procedure execution error invalid statement

Question

I'm following a tutorial on PL/SQL http://www.plsqltutorial.com/plsql-procedure/. I have created procedure with the following code on apex:

CREATE OR REPLACE PROCEDURE adjust_salary(
    in_employee_id IN EMPLOYEES.EMPLOYEE_ID%TYPE,
    in_percent IN NUMBER
) IS
BEGIN
    UPDATE EMPLOYEES
    SET salary = salary + salary * in_percent / 100
    WHERE employee_id = in_employee_id;
END;

However when I try to run

exec adjust_salary(200,5);

I got error

ORA-00900: invalid SQL statement.  

What is the problem and how to fix it?

Answer 1

I see nothing wrong with your PL/SQL. You should check to see if the Procedural Option is installed:

http://www.techonthenet.com/oracle/errors/ora00900.php