Help me in solving GSQ09 problem

My issue

I have written correct query can somebody explain what’s wrong in this?

My code

/*Write a query to set the Department as 'HR', for the employee with employee_id 2 to the existing table employee. */
UPDATE EMPLOYEE 
SET Department="HR" 
WHERE employee_id = 02;

Learning course: Learn SQL
Problem Link: CodeChef: Practical coding for everyone