./Shake.hs && ./Shake is broken for me

error.txt

[127] adept@dimail> ./Shake all                                                                                                                                                   ~/devel/haskell/darcs-get/hledger
stack ghc tools/pandoc-drop-web-blocks
[1 of 1] Compiling Main             ( tools/pandoc-drop-web-blocks.hs, tools/pandoc-drop-web-blocks.o )

tools/pandoc-drop-web-blocks.hs:4:1: error:
    Could not find module ‘Text.Pandoc.Builder’
    Use -v to see a list of the files searched for.
  |
4 | import Text.Pandoc.Builder
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^

tools/pandoc-drop-web-blocks.hs:5:1: error:
    Could not find module ‘Text.Pandoc.JSON’
    Use -v to see a list of the files searched for.
  |
5 | import Text.Pandoc.JSON
  | ^^^^^^^^^^^^^^^^^^^^^^^
Error when running Shake build system:
* all
* website
* site/timedot.md
* tools/pandoc-drop-web-blocks
user error (Development.Shake.cmd, system command failed
Command: stack ghc tools/pandoc-drop-web-blocks
Exit code: 1
Stderr:
tools/pandoc-drop-web-blocks.hs:4:1: error:
    Could not find module ‘Text.Pandoc.Builder’
    Use -v to see a list of the files searched for.
  |
4 | import Text.Pandoc.Builder
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^

tools/pandoc-drop-web-blocks.hs:5:1: error:
    Could not find module ‘Text.Pandoc.JSON’
    Use -v to see a list of the files searched for.
  |
5 | import Text.Pandoc.JSON
  | ^^^^^^^^^^^^^^^^^^^^^^^
)