New Rubber Ducky Owner need help :D

[LOKailee]

So I just got my rubber ducky and I'm still trying to figure it out and well, I tried the encoder.jar and this is what I got:

C:\Users\ *Classified :) * \Desktop>java -jar encoder.jar -i desktopprank.txt -o media/DUCKY/
inject.bin

-={ HAK5 :: TRUST YOUR MOTHERDUCKING TECHNOLUST }=-

USB Rubber Ducky Encoder v3.0.0

Script: yolo.txt

Loading DuckScript ..... [ OK ]
Spawning Ducklings ..... [ OK ]
Generating Keyboard Settings ..... [ OK ]
Localising Keyboard Settings ..... [ OK ]
Preprocessing Script ..... [ OK ]
Encoding Script ..... [ OK ]
Writing Binary File ..... [ FAILED ]

Anyone know a fix for that last part? I'd really appreciate it :)