Overview
If you see the error "Sorry, we were unable to start your session", the Parkable app couldn't start your parking session. It's usually caused by a failed payment, but other causes include the parking facility being full or recent changes to the parking facility setup.
Check your payment
The most common cause is a previous failed payment — Parkable can't start a new session while a payment is outstanding.
See My payment has failed, how do I fix this? for how to retry.
Other things to check
You're new to Parkable — make sure you've added your vehicle's licence plate (see Add or remove a vehicle from your profile) and a payment method (see Add a credit card to your profile)
The parking facility is full — see I've arrived at my car park and the app is telling me that it is full, how can I park?
The app isn't responding properly — see My Parkable app is not loading for general troubleshooting
Still stuck?
If none of the above fixes it, contact Parkable support — see Get help in the Parkable app for how.