Expression evaluation error at function a!imageField [line 53]: The image at index 1 in an image gallery component [label=""] has an invalid value for "document". "document" must not be null.

Question

I am new and working on the developer course. I am on exercise 8 create an interface, on the Create a Reusable Interface section. 
When I completed the steps to make AX_VehicleDetailsView and clicked save. It popped up with the interface! But this is the error that I got when it opened, and I don't understand where I go to fix this!
Thank you

richardm900458 · Answer

intro: i did not do the specific exercise but some general information

the error tells you already the issue :) ri!vehicle, your recordtype is a null value
In result you don't have a value for vehicle.image neither there

a!documentimage wont work properly with a null or empty value for the "document:" paramater
you need a picture aka document in your application and the ID of the document needs to be the value of ri!record[AC_vehicle.image]

perhaps this link helps you:
docs.appian.com/.../Document_Image_Component.html

edit: you can try the following in the test parameters of your rule input:
docs.appian.com/.../reference-records.html

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