CHICAGO (CBS) — Hundreds of drivers who thought they had paid for parking through an app on their smartphones have gotten tickets in Chicago, reports WBBM’s Nancy Harty.

317 cars have been ticketed for expired meters since mid-April even though their owners paid using the Park Chicago app, according to Parking Meter spokesman Scott Burnham. He says that is less than one percent of the more than 81,000 tickets issued throughout the city at that time.

But the blogger who calls himself the “parking ticket geek” Mike Brockway says the app wasn’t available across the whole city.

“A lot of people are just happy to use the meter boxes and just pay that way so I don’t think it is a real apples-to-apples comparison,” said Brockway.

Parking via app should be citywide by the end of the summer. If you did get a ticket despite using the app, Burnham says it can be dismissed over the phone if you have your confirmation number.