What part of stack uses JSON? And why would this appear in a previously functioning stack installation? One clue is that I might have installed ghcup just before this. Not sure if that's related. Not sure how to uninstall ghcup.

I'm on a Mac.

Mike

On Sat, Oct 24, 2020 at 6:09 PM Henning Thielemann <lemming@henning-thielemann.de> wrote:

On Sat, 24 Oct 2020, Dennis Raddle wrote:

> I get this error when running stack:
>
> Downloading lts- xxxx building plan
> aesonException "Error in $['system-info']: key \"os\" not present"
>
> running "stack update" didn't help.
> I'm very confused because I don't remember what I did that provoked this error.
> Anyone know what's going on?

aesonException and the error message suggest an error in a JSON file ...