The first thing to do is to check the error with the card. Input the SD card into your computer through a card reader and then check it for errors. If you don't have anything on the SD card, format it. You can do it using the standard Format tool in Windows or install an application called MiniTool Partition Wizard.
Once the card is formatted and ready pe be used again, insert it into the device and test its behavior. The error should be fixed now, but if it says the same thing, then the device is faulty or the SD card needs to be replaced as well.
