Google Apps Script and Spreadsheet as Metafields Bulk Editor

[Kel06]

I'm using this open source code: https://gist.github.com/kmeister2000/54195b7ba6eb5cd6cdd5cf962f882f6a that allows to bulk edit metafields using google spreadsheet, but upon following the steps and deploying the webapp I'm getting this error:

Spreadsheet Values:

Can someone help me with this? Thank you

[Kel06 · Accepted solution]

Issues solved on my end