iPhone App Submitting - Error ITMS-90171 Invalid Bundle Structure Can't Contain Standalone Executables

I've included screenshots of the full error messages I'm getting. This happens when I try and submit my app to iTunes Connect. I don't get any errors when running the app.

First Error

Second Error

Solution

I had the exact same error for my application, and I was not able to find any reason from the information. The difference was, though, that I got it for all my .dll files.

After some time, I saw that under IOS Bundle Signing - Custom entitlements it tried to point to a file that did not exist. I just removed that, and it stopped giving errors.

Not sure if it helps you too, but it worked for me.