I've also ran into this problem today with the seal treasure.

Our Technicians are investigating the issue and will try to fix it as soon as possible,

In the mean time, you can send a log file to email: narutoen_support@oasgames.com

How to get logfile: Write anywhere while playing the game “hylogfile” (without “”, you don’t have to write it in a text box) then a window will pop-up. Save the file that you are given by the system and please send it to us.

Thank you for your understanding!