Web Reference: Are you running this code from the script editor (by clicking the play button)? If so, that would explain the error, as the code is not meant to be run from the script editor, and it is normal... Dec 16, 2022 · I copied this script from Stackoverflow and changed it a little bit according to my requirements. It is supposed to send an email to an email address in Column D when the checkbox is checked in Column I. But it is giving this error: "TypeError: Cannot read properties of undefined (reading 'source')" Here is my sample Sheet ` Ever had this error in Google Apps Script and not sure what's going on? "TypeError: Cannot read properties of undefined" In this video, I'll show you why you get this error and how to deal...
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