Can not add the package

[weihevt]

When I add the package, Julia gives me an error. I thought it is about the version of the package.

(v1.3) pkg> add Evolutionary
 Resolving package versions...
ERROR: Unsatisfiable requirements detected for package UnPack [3a884ed6]:
 UnPack [3a884ed6] log:
 ├─possible versions are: [0.1.0, 1.0.0-1.0.1] or uninstalled
 ├─restricted to versions 1.0.1 by an explicit requirement, leaving only versions 1.0.1
 └─restricted by compatibility requirements with Evolutionary [86b6b26d] to versions: 0.1.0 — no versions left
   └─Evolutionary [86b6b26d] log:
     ├─possible versions are: [0.3.0, 0.4.0, 0.5.0, 0.6.0-0.6.1] or uninstalled
     └─restricted to versions * by an explicit requirement, leaving only versions [0.3.0, 0.4.0, 0.5.0, 0.6.0-0.6.1]