When the POS machine displays the error code 0 1, it means that the card swiping operation is unsuccessful. Due to credit card damage, the card does not support this transaction type, the credit card information is wrong or the credit card equipment is faulty. If you encounter this error code, first check whether the credit card is normal and ensure that the card is not damaged or expired. Confirm whether the card supports the transaction type, such as debit card or credit card.