Currently I was given a collection for postman, but it is using version 1 so I need to convert it to version 2 by using the plugin postman developed which this.
I followed exactly what they wrote and followed the command they gave but still is displaying this

May know I why it is not reading my the output file that I already inserted.
There are a few errors in your command (e.g. using
-inputinstead of--inputor keeping the<>), here's an example from the official GitHub repository:I'd recommend using this one replacing the values you need.