I have built, run, compiled, simulated, and evaluated on my local nix server/client env. I am running Ubuntu 21.04, Kernal 5.11.0-46lowlatency.

Here is the terminal output:

[Info] Running: (Nothing,Webserver {_port = 8080, _maxInterpretationTime = 80s})
Initializing Context
Initializing Context
Warning: GITHUB_CLIENT_ID not set
Warning: JWT_SIGNATURE not set

Interpreter ready

I actually already asked about the GitHub ID in another question, but am looking for guidance on the JWT_SIGNATURE setting indicated in t he last warning line before Interpreter ready statement.

Or, am I missing something more obvious than that, like the (Nothing,Webserver{...}) statement in line 1?

Thank you for any help in advance!!

  • 1
    I have got the same warning when running the plutus-playground-server locally. You should be able to use the Playground despite there is a warning. I think this is only needed if the playground will be deployed somewhere and you want to offer a Login via Github Open Auth flow. Jan 12, 2022 at 15:30
  • Thank you for the quick response, Marco. Jan 14, 2022 at 14:21

1 Answer 1


As Marco writes, this is fine. The (Nothing,Webserver { ... }) line is just informative. The warnings are also of informative value only and do not constitute an actual error.

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