According to web page, check battery.
https://www.accu-chek.com/meters/aviva-meter/support-error-screens
Look for E-9 image and click to see the message.
E-9 message
"E-9" in the display means the battery is almost out of power. Change the battery now. If the message reappears after the battery has been replaced, reset the meter. To reset the meter, remove the battery, press any meter button, then reinsert the battery.
Download the owner's booklet now and refer to Chapter 7, "Changing the Battery."
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