[SOLVED] error_callback : patch fail ragnarok 2

When update ragnarok 2, it suddenly give error_callback : patch fail , to solve this:
1. Install ragnarok 2 to another computer
2. Update it until it can be played
3. Exit the game, copy the game folder
4. Paste the folder on your computer that give error, you can overwrite the old game folder
5. Play

It's not really a solution, but it works for me, lol
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