Create invoice from Creator

Create invoice from Creator

Hello, I have signed up for Zoho Invoice to investigate if it is useful for me to create invoices from Creator. Zoho Invoice is setup, I have read your integration doc: https://help.creator.zoho.com/Integration-with-Zoho-Invoice.html And I have created a Form to test this. But I when I process the form no invoice is created and the log details says: Error in zoho.invoice.createdraft I can not figure out what;s wrong here. So some help is appreciated. The app (named FactuurTest) is shared to support.