BundleValidationError "0"

Hello Make Community,

I am trying to connect my WhatsApp chatbot on Botpress to collect my customers’ data directly into a Google Sheet, but I keep encountering the same issue and can’t figure out where it’s coming from. I have connected the bot with the Make webhook and linked it to Google Sheets, but I think I’m doing something wrong. The system always says “BundleValidationError > Collection can’t be converted to text for parameter ‘0’.” and I would like to understand how to fix it. This is the code I have inserted into the bot: