What code are we talking about?
Then you need to update DirectX from the official Microsoft website at this link: https://www.microsoft.com/en-us/download/details.aspx?id=35&44F86079-8679-400C-BFF2-9CA5F2BCBDFC=1
Hi! When you kill the boss, the character appears and tells you the number of the key. But as far as I know, the key has already been won by someone.