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Remove everything from your s4 directory that didn't come with it. Even better, uninstall s4, delete its folder, then reinstall it. Then, keep a close eye on what's in your s4 folder as you "install" trainers, so you can remove them as necessary.
It pretty much has to be the remnants of a single trainer lying around, since s4 itself wouldn't have such an error message and I doubt all trainers use that common error message.
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