Week 4 issue with Cabal build: Not in scope: type constructor or class 'JWT.EncodeSigner'

Question

When running cabal build or cabal repl in the core/week04 folder I get the following error message when building the playground-common-0.1.0.0 package:

src/Auth.hs:130:41: error:
    Not in scope: type constructor or class 'JWT.EncodeSigner'
    Module 'Web.JWT' does not export 'EncodeSigner'
    |
130 |         { _configJWTSignature       :: !JWT.EncodeSigner
    |                                         ^^^^^^^^^^^^^^^^ 

I am in the correct branch in the plutus-apps repo as per the cabl.project file in code/week04. I've run cabal update and it was successful.

Does anyone have any ideas how to resolve this?

Answer 1

Be sure to do a git pull for both 'plutus-master' and 'plutus-pioneer-program'. Then set the right git-checkout tag (of the week's cabal project file) Restart nix-shell so it builds the 'plutus-master', after that you can do the following to resolve missing dependencies in the 'week' folder:

• cabal clean
• cabal update
• cabal build
• cabal repl

This should work