user5573: 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?

user6569: 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

5573: <p>When running <code>cabal build</code> or <code>cabal repl</code> in the core/week04 folder I get the following error message when building the playground-common-0.1.0.0 package:</p>
<pre><code>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
    |                                         ^^^^^^^^^^^^^^^^ 
</code></pre>
<p>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.</p>
<p>Does anyone have any ideas how to resolve this?</p>
 6569: <p>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:</p>
<ul>
<li>cabal clean</li>
<li>cabal update</li>
<li>cabal build</li>
<li>cabal repl</li>
</ul>
<p>This should work</p>
