Formula is not working for conversion

I have a google sheet hat use formulas in the headers, and in my app most of them is working, but not the currency convert part like this.

 

={"R Per Maand";ARRAYFORMULA(IF(LEN(B2:B),I2:I*GOOGLEFINANCE("CURRENCY:USDZAR"),))}

and give error ="COMPUTED_VALUE".

How can I fixed this 

 

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It means the app tries to save a value to it.. set the column as read_only (not editable) and double check that you don't have anything in the sheetformula field in that column's definition.

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