What is wrong with using array formulas?

Question

Google Sheets

I'm trying to make everything beautiful by combining the array formula with the column name, but an error arrives:

Without the array formula, the values ​​​​are perfectly checked and parsed from the "reference" tab to cell K6 and below with a simple formula:
=IF(C6=0;""; VLOOKUP(C:C;'справочник'!B:D;3;0))
But the formula I need does not work:

={"Статья";ArrayFormula(IF(offset(C5;1;;numRows)=0;""; VLOOKUP(C5:C;'справочник'!B:D;3;0)))}

Plz tell me the correct solution.

upd: link to spreadsheet

Answer 1

Maybe bypassing ARRAYFORMULA should start with C6?

={"Статья";ARRAYFORMULA(IFERROR(VLOOKUP(C6:C;'Справочник'!B:D;3;0)))}