"devtool" command fails with "TypeError: 'NoneType' object is not callable"

Running the devtool env -vv . command in the base environment will sometimes fail with the following error:

File "<path/to/project>/conda/meta.yaml", line 64, in top-level template code
    - {{ pin_compatible('scikit-image') }}
TypeError: 'NoneType' object is not callable

This issue has been confirmed on multiple virtual machines. The dev-profile is found and the pinned dependencies have been properly defined. Removing the dependency that causes the error does not fix it as other dependencies will trigger it. Multiple people have looked at the configurations and cannot find anything wrong with them. Since the environment has been successfully created on other machines, the dev-profile configurations are probably not the cause.