This package cannot be installed

[mawc2019]

This package cannot be added in Julia. The error message is as follows.

ERROR: The following package names could not be resolved:
 * FastChebInterp (not found in project, manifest or registry)

[stevengj]

It's not a "registered" package, so you have to specify the URL when adding it:

pkg> add https://github.com/stevengj/FastChebInterp.jl