This can happen due to a lack of memory on the computer.
Follow the steps below:
1) Restart the computer and try running the game again.
2) Close all other programs except Bless Online so that the computer doesn't use up any additional memory.
3) Run the Steam client under administrator.
4) Check Integrity.
: Run Steam -> Library -> Bless Online - > right click
-> select properties -> select the local files tab -> select game integrity check
5) If the above solutions don't work, please submit a ticket providing the following information about the issue:
: Windows + R -> dxdiag Search -> Select Save All Information
-> Save the dxdiag to the desktop -> Submit a ticket with the attached information