Hashcat attack on skype

Hello everyone, I was looking this video on youtube: /watch?v=8fxLH-pokAI about how to do dictionary attack on a skype username with Hashcat.

In my cmd I wrote this:

C:\Users\**>cd C:\Users\**\Desktop\hashcat-0.47

C:\Users\**>cd C:\Users\**\Desktop\hashcat-0.47>hashcat-cli64.exe -m 23 --output-file=cracked2.txt --remove hash2.txt wordlists2/

but it gave this:

hashcat-cli64.exe: unknown option -- output-file=cracked2.txt


in my hash2.txt i wrote 3af0389f093b181ae26452015f4ae728:user


What could I do to make it work?