cannot install MLPreprocessing

[gpapalambrou]

Dear All,
I am trying to add MLPreprocessing as follows but it fails:
julia> import Pkg; Pkg.add("MLPreprocessing")
ERROR: The following package names could not be resolved:

• MLPreprocessing (not found in project, manifest or registry)

I am using macOS Big Sur and the magnificent Julia Version 1.6.0.
Thanks, George

[kazucmpt]

Me too. I could not install this package.

[sosiristseng]

Even ]add https://github.com/JuliaML/MLPreprocessing.jl gives me an error:

ObsDims (from LearnBase) not defined