If you get an error message when logging in to the scan app, this can be due to several things. First check whether your smartphone or tablet is connected to the internet. You can quickly see this by the synchronisation icon. If there is a line through it, the Scanning app is offline. Connect to the internet via Wi‑Fi or 4G. Also check whether you are using the latest version of Paylogic Scanning. You can see this in the Google Play Store or Apple Store.