1. Maybe there is something wrong with the card reader in the library. At this time, the credit card machine can't recognize your credit card information, so there will be no response.

In this case, you can report to the library staff for repair.

There may be something wrong with your card. Because the machine reads the card according to the magnetism on the card, if your card is demagnetized because of the physical meaning, the machine naturally cannot sense the card, so there is no response.

In this case, you should find the library staff and ask them if they can magnetize the card or change it.