"ERROR: Unsatisfiable requirements detected for..." how to understand this?

[Mattriks]

Welcome to the julia discourse forum!
Here are some other posts with the same q:
https://discourse.julialang.org/search?q=unsatisfiable%20requirements%20order%3Alatest

and there is a general explanation here:

Incompabilities between package versions

Yes currently installation order matters when their are version dependencies. If you have added a package A independently (the latest version) to an environment, and later try to add package B which depends on a different version of package A, then currently the pkg manager does not auto-regrade package A. Instead the pkg manager throws a warning that the version of A you have already is not compatible with the version of B you’re trying to install. It’s different when you add package A to an e…

So try add Distributions@0.18 then add Expectations