1. The card reader of children's painting early education machine is damaged. Replace the card reader and insert the card.
2. If the metal interface of the memory card of the children's painting early education machine is in poor contact, take out the memory card, then wipe the metal interface of the memory card back and forth with an eraser several times, then clean it with alcohol and blow dry it with a hair dryer.
3. There is something wrong with the circuit board of the children's painting early education machine. If the early education machine is still under warranty, you can call customer service.