For those late to the game, AWB has always only run on Windows, so complaining now just shows your ignorance.
That said, you would think some enterprising MediaWiki volunteer developer would have made a better competing tool that runs on a cross platform language like Python. Still, you gotta give AWB credit for doing lots of stuff quite well.
This could be several different things:
in AWB, please go to the Help and About and include the Operating system, the .NET version, the version of AWB that shows up, the complete error message and if possible the Wiki you are trying to use it on.
Having said that, if the Wiki is a Wikia extension it should work. If the wiki has already changed to the Fandom extension, it may not work until the devs push out the next update. The last update doesn't include Fandom although it may work if you put it into the custom project in preferences.