Update 2431 and archives

I don't think it has ever worked, I assume you must have had runtime packers disabled if you didn't get the error before:

 

But O.P. said it detected something, not that there was no error.

 

And early this error was actual, in July yet. Then ESET update something and error disappeared, but in August it came back.

 

Definitely the error occurs due to the fact that the fsg archive is patched. It's not a real error that should be fixed. Nevertheless, AH can emulate it fine so you are protected even against malware in such patched files.