LY Count expression

[#1]

Hello,

Can anyone offer help with the below expression? The report brings back -, not sure what i'm doing wrong.

num (ROUND (

count({< stock_out_ind={'1'}, fiscalyear={$(=max(fiscalyear)-1)}>} sku)

/

count({<fiscalyear={$(=max(fiscalyear)-1)}>} sku)

,.0005),'#,##0.0') 

Thanks,

Sara