Getting an error while trying to flatten a file on my cmd

i had to try different things to see if i can get it as the image will show. please help

Hey @Padom2020 and welcome.

Can you share with us what you’re trying to achieve? What documentation are you following?

It’s open zeppelin library I am using and I am trying flatten a particular file in the library to a folder in my project file

I am following a tutorial by dapp University on creating an NFT and I using truffle flattener for these