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Before asking for help, please read the Common Solutions below first.
We only support the North American client. You must change your client REGION to NORTH AMERICA using the NCSoft launcher, then repair your game after doing that.
Your Client contains modified or broken files, Use the NCsoft Launcher to Repair your Client to a working state.
You are missing files necessary to connect, please Download and Reinstall Aion Launcher again.
Start the Aion Launcher as Administrator.
Download the files here and place it in your Aion Client (C:/Program Files/NCsoft/Aion/) folder.
Run the bat file to start the game.
Please Report it here