A glitch with the Philadelphia Parking Authority's parking kiosks in the city has prompted the agency to open the spots up as free parking on Sunday. And officials say some drivers may have been unfairly ticketed because of the issue.

The tall green kiosks accept cash and credit card payments for a number of spots in Center City and University City.

Parking authority (PPA) spokesman Marty O'Rourke said there is an issue with the kiosks wirelessly transmitting credit card information.

On Sunday, the PPA will not be ticketing people who park in spots covered by the kiosks. Drivers still need to pay at single payment meters and adhere to other parking rules, O'Rourke said.

Officials are working to fix the issue, which began on Friday, but are not clear on when that might happen. If the kiosks are still not transmitting credit card data on Monday, drivers will have to use cash, O'Rourke said.

The problem began on Friday and PPA officials said some drivers may have been incorrectly ticketed because of it.

They are telling anyone who believes they were unfairly ticketed to email their Customer Service Department at sruiz@philapark.org.