This error means that there is Matching Question Field(s) which appears on your Google Docs template, yet there is no respective question(s) found on your Google Docs:

If you gets this error, you will not be able to generate document/PDF when a respondent submits.

To solve this error: simply add the missing question to your Google Forms (e.g. Reason to Leave)

Error 2: Missing Field on File Template

This error means that there is question(s) found on your Google Forms, yet its respective Matching Question Field(s) is not found on your Google Docs template:

If you gets this error, you can still generate document/PDF. However, your generated document/PDF will not include the missing Matching Question Field(s).

To solve this error: simply add the missing question to your Google Docs (e.g. Reason to Leave).