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1. How to fix 'Invalid argument: timeZone. Should be of type: String'?

1. Open your Google Sheet. 
2. Go to File > Spreadsheet settings. 
3. In the "General" tab, find the Time zone setting. 
4. Change the time zone to a different one, then click Save settings. 
5. Go back to File > Spreadsheet settings. Change the time zone back to your desired, correct time zone (e.g., "America/Vancouver" or a nearby city with the same offset). 
6. Click Save settings again. 

This process forces the system to re-validate and update the time zone setting, which usually resolves the "Invalid argument" error.