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Try settings-apps-all-contacts,force stop and clear data.Restart the device.
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I'm sorry to hear. Hard to say exactly what have happened in this case if you don't remember the error message. But if the contacts have disappeared, something have gone wrong. Since you cannot find any vCard files when you try to import contacts, it does not sound like you have created any backup. Have you checked if you have any contacts on your Google account for example?