Why do I get this error?

Question

Mike Schmitt · Accepted Answer

That means your local!skill variable does not contain a property named "idSkill" (at least at one particular iteration of a!forEach()), yet you're trying to reference the property by dot-notation anyway. 
 The "real" solution for this would of course be to ensure that your "local!skill" variable is clean, i.e. ensuring it always contains that property (unless it's null/empty), but as a quick workaround, you can replace fv!item.idSkill with property(fv!item, "idSkill", null()) , which will attempt to access the "idSkill" property from the current iteration, and if none is found, return null instead.

Mike Schmitt · Answer

I'm guessing the issue you're facing is in your a!forEach() statement at the bottom here. When you reference ri!recordCandidateSkills[fv!index], Appian can be finnicky about addressing an index in an array that does not [yet] exist. What you should do instead is think of this in terms of assembling the entire array you want ri!recordCandidateSkills to contain, and saving the whole assembled thing all at once. I'll attempt to freehand what i'd suggest you re-write it as, though this might need further refining: 
 a!save(
 ri!recordCandidateSkills,
 
 if( /* note, this is somewhat unnecessary as a!forEach returns an empty set in this case anyway */
 a!isNullOrEmpty(local!skill),
 {},
 
 a!forEach(
 local!skill,
 fv!item.idSkill
 )
 )
)

Why do I get this error?

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