Doesn't seem to me like you've been banned. But try the following steps:
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Try to verify integrity of the game (if it's the Steam-version). Maybe won't work in your case
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Redownload Plutonium: https://plutonium.pw/
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If you don't have the Steam version: Redownload your desired game like on the Plutonium-Website instructed. https://plutonium.pw/docs/install/#installing-the-base-game-bo2