Unrecognised function or variable 'avg_temperature' on Matlab

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Hi Team

I need some help here quickly, i have this code below. What changed here is channel setting on my channel to be public, before it was private. Now i am getting unrecognised function or variable and cant seem to solve this issue, yet i am using the new feauture for sending or creating email using Matlab https://www.mathworks.com/help/thingspeak/sendalert.html

data = thingSpeakRead(929272, "NumMinutes", 100);
aveTemp = mean(data(:,3));
apiKey = 'O6P4N8AVZWKNGK5U';
alertURL = "https://api.thingspeak.com/alerts/send";
options = weboptions("HeaderFields",["ThingSpeak-Alerts-API-Key", apiKey]);
alertBody = sprintf("The temperature is %0.2fF.", aveTemp);
alertSubject = sprintf("! Temperature exceeded 60.0F!");
if avg_temperature > 60.0
    webwrite(alertURL, "body", alertBody, "subject", alertSubject, options);
end