Expression evaluation error with the appian learn Step-by-Step guide

Certified Associate Developer

I'm doing the step-by-step guide for appian developer where we're recreating the Acme Automobile example application and I encountered an error when trying to display the vehicle images in the grid.

I followed all the points in the step by step guide exactly and the error I keep encountering is the following:

Expression evaluation error at function a!gridField_23r3 [line 51]: A grid component [label="null"] has an invalid value for "columns". A grid column [label="Image"] has encountered an error. Expression evaluation error at function a!imageField [line 5]: User Does Not Have Rights to Perform this Operation

The expression I'm using to display the image is the following: 

if( a!isNullOrEmpty( fv!row[recordType!W#SA Vehicle.fields.image] ), a!EXAMPLE_DOCUMENT_IMAGE(), fv!row[recordType!W#SA Vehicle.fields.image] )

where the W#SA is only a placeholder and I have replaced it with my own prefix of course (references work).

If anyone has any suggestions or guidance for why this might have happened please let me know. 

Thanks.

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