"Unexpected exception: Media stream not specified"

[Corktail]

When i try to run the datamix14 script, it gives me this error:

It does not let me specify the media stream, i don't even know what that means.
I am using VEGAS Pro 15

[rgndxzzk]

for me this popped up when windows security blocked avidemux2cli from "protected folders"; after i added an exception to it it worked fine 👍