[Haskell-cafe] error when running stack

Dennis Raddle dennis.raddle at gmail.com
Sun Oct 25 01:33:39 UTC 2020

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.

On Sat, Oct 24, 2020 at 6:09 PM Henning Thielemann <
lemming at 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 ...
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