The solutions to this problem are: insufficient credit card limit, POS machine failure, credit card being frozen or reported lost, and credit card bill being overdue.

1. The credit card limit is insufficient. The credit card limit must be sufficient to cover the consumption amount, otherwise there will be a problem that the card cannot be swiped. This can be solved by paying off your debt or increasing your credit card limit.

2. POS machine failure. If other credit cards can be swiped normally on the POS machine, then there is a problem with your credit card. You can contact the merchant or POS machine maintenance personnel for inspection and repair.

3. The credit card is frozen or reported lost. If the credit card is frozen or reported lost, it will result in the inability to swipe the card. You need to unfreeze or unhook your credit card before you can use it normally.

4. Credit card bills are overdue. If the credit card bill is overdue, the credit card cannot be used normally. You can check the payment date of your credit card bill and make timely payments to avoid overdue problems.