Apps with PackageCompiler - errors with examples in documentation

I’m attempting to learn to use PackageCompiler to make apps, using the instructions here (with a direct copy of the example code).
The app building steps work (if slowly), but when attempting to run the demo app on MacOS I get:

% MyAppComp/bin/MyApp
ERROR: could not load library "/Applications/"
dlopen(/Applications/, 6): image not found
zsh: segmentation fault  MyAppComp/bin/MyApp

On Linux, I get the same error (with .so instead of .dylib and so on).

Any ideas what is missing or what is causing this error? So far I cannot find any hints as to why the shared library paths are not working…