This error message generally indicates that Paprika is unable to establish a secure (HTTPS) connection with our sync servers.
On Android we've seen this occur if the date/time is not correctly set on your device, or if there is something on your network that is blocking the connection.
You can try resolving the issue by:
- Making sure the date/time is set correctly on your device.
- Connecting to a different wifi network and attempting to sync from there.