Notification of UE4 Project Release Form


I just uploaded a game in Google Play but I have a problem with “Notification of UE4 Project Release Form”.

First, the game is free for download but the document ask me a price for unit.
Second, if I write any price for exemple 0; 0.00; 0.001 or 1 it gives me an ERROR: The security code does not match.

What to do? Thanks in advance!