ERROR: The following package names could not be resolved: Pyplot

Hello !
For a course I am trying to use julia for the first time. I tries to use the package Pyplot (I had it with python).
But, when I run the command: Pkg.add(“Pyplot”)
I get this error I didn’t find about on internet:

[1] pkgerror(::String) at D:\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.4\Pkg\src\Types.jl:53
[2] ensure_resolved(::Pkg.Types.Context, ::Array{Pkg.Types.PackageSpec,1}; registry::Bool) at D:\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.4\Pkg\src\Types.jl:794
[3] add(::Pkg.Types.Context, ::Array{Pkg.Types.PackageSpec,1}; preserve::Pkg.Types.PreserveLevel, platform::Pkg.BinaryPlatforms.Windows, kwargs::Base.Iterators.Pairs{Union{},Union{},Tuple{},NamedTuple{(),Tuple{}}}) at D:\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.4\Pkg\src\API.jl:148
[4] add(::Pkg.Types.Context, ::Array{Pkg.Types.PackageSpec,1}) at D:\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.4\Pkg\src\API.jl:112
[5] #add#27 at D:\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.4\Pkg\src\API.jl:109 [inlined]
[6] add at D:\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.4\Pkg\src\API.jl:109 [inlined]
[7] #add#24 at D:\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.4\Pkg\src\API.jl:107 [inlined]
[8] add at D:\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.4\Pkg\src\API.jl:107 [inlined]
[9] add(::String; kwargs::Base.Iterators.Pairs{Union{},Union{},Tuple{},NamedTuple{(),Tuple{}}}) at D:\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.4\Pkg\src\API.jl:106
[10] add(::String) at D:\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.4\Pkg\src\API.jl:106
[11] top-level scope at REPL[5]:1

What should I do to install this package ?

Thanks a lot !

Pyplot -> PyPlot

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