Error message #CALC!

I´m watching this video on youtube 

https://www.youtube.com/watch?v=D44EDant0rs&t=254s

I´m on the step I place the following formula:

=SORT(UNIQUE(FILTER(Ledger[Stock],SUMIF(Ledger[Stock],Ledger[Stock],Ledger[Units])<>0)))

And it shows me #CALC!