I looked at the error and this happens if the plugin cannot determine the package options from your form.
It must be related to how you have set up your “Initial package” form question. Can you send me a screenshot and more details on how you have configured your form?
I’ve released a new version of the plugin yesterday that fixes some minor things. Could you retry it? (“Update data from Google Forms” and then “Validate settings”)
If that does not help (which is likely) then yes, please send an invite to support@fabman.io.