Problem with ``Unsatisfiable requirements detected for package"

New to Julia
1

I am using Julia version 1.1.0 on a Windows computer. When I try to install the Permutations.jl package (listed here), I get the following error. What should I do ? I cannot even interpret the error message.

julia> Pkg.add("Permutations")
 Resolving package versions...
ERROR: Unsatisfiable requirements detected for package Permutations [2ae35dd2]:
 Permutations [2ae35dd2] log:
 ├─possible versions are: 0.3.0-0.3.2 or uninstalled
 ├─restricted to versions * by an explicit requirement, leaving only versions 0.3.0-0.3.2
 └─restricted by compatibility requirements with Combinatorics [861a8166] to versions: uninstalled — no versions left
   └─Combinatorics [861a8166] log:
     ├─possible versions are: [0.7.0, 1.0.0] or uninstalled
     └─restricted to versions 1.0.0 by an explicit requirement, leaving only versions 1.0.0
Stacktrace:
 [1] #propagate_constraints!#61(::Bool, ::Function, ::Pkg.GraphType.Graph, ::Set{Int64}) at C:\cygwin\home\Administrator\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.1\Pkg\src\GraphType.jl:1005
 [2] propagate_constraints! at C:\cygwin\home\Administrator\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.1\Pkg\src\GraphType.jl:946 [inlined]
 [3] #simplify_graph!#121(::Bool, ::Function, ::Pkg.GraphType.Graph, ::Set{Int64}) at C:\cygwin\home\Administrator\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.1\Pkg\src\GraphType.jl:1460
 [4] simplify_graph! at C:\cygwin\home\Administrator\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.1\Pkg\src\GraphType.jl:1460 [inlined] (repeats 2 times)
 [5] resolve_versions!(::Pkg.Types.Context, ::Array{Pkg.Types.PackageSpec,1}, ::Nothing) at C:\cygwin\home\Administrator\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.1\Pkg\src\Operations.jl:371
 [6] resolve_versions! at C:\cygwin\home\Administrator\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.1\Pkg\src\Operations.jl:315 [inlined]
 [7] #add_or_develop#63(::Array{Base.UUID,1}, ::Symbol, ::Function, ::Pkg.Types.Context, ::Array{Pkg.Types.PackageSpec,1}) at C:\cygwin\home\Administrator\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.1\Pkg\src\Operations.jl:1171
 [8] #add_or_develop at .\none:0 [inlined]
 [9] #add_or_develop#15(::Symbol, ::Bool, ::Base.Iterators.Pairs{Union{},Union{},Tuple{},NamedTuple{(),Tuple{}}}, ::Function, ::Pkg.Types.Context, ::Array{Pkg.Types.PackageSpec,1}) at C:\cygwin\home\Administrator\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.1\Pkg\src\API.jl:54
 [10] #add_or_develop at .\none:0 [inlined]
 [11] #add_or_develop#14 at C:\cygwin\home\Administrator\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.1\Pkg\src\API.jl:31 [inlined]
 [12] #add_or_develop at .\none:0 [inlined]
 [13] #add_or_develop#13 at C:\cygwin\home\Administrator\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.1\Pkg\src\API.jl:29 [inlined]
 [14] #add_or_develop at .\none:0 [inlined]
 [15] #add_or_develop#12(::Base.Iterators.Pairs{Symbol,Symbol,Tuple{Symbol},NamedTuple{(:mode,),Tuple{Symbol}}}, ::Function, ::String) at C:\cygwin\home\Administrator\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.1\Pkg\src\API.jl:28
 [16] add(::String) at .\none:0
 [17] top-level scope at none:0
2

What version of Combinatorics do you have?

using Pkg
Pkg.status("Combinatorics")

Permutations

name = "Permutations"
uuid = "2ae35dd2-176d-5d53-8349-f30d82d94d4f"
author = ["Edward Scheinerman <ers@jhu.edu>"]
version = "0.4.0"

[deps]
Combinatorics = "861a8166-3701-5b0c-9a16-15d98fcdc6aa"
LinearAlgebra = "37e2e46d-f89d-539d-b4ee-838fcccc9c8e"
Random = "9a3f8284-a2c9-5f02-9a11-845980a1fd5c"

[compat]
julia = "1"
Combinatorics = "1.0"
3

My Combinatoics version is 1.0.0, as shown below

julia> Pkg.status("Combinatorics")
    Status `C:\Users\iamsu\.julia\environments\v1.1\Project.toml`
  [861a8166] Combinatorics v1.0.0

I was unable to understand the purpose of the other things that you wrote, due to my lack of knowledge about version conflict resolution :frowning: . I would be grateful if you could provide a few more words of explanation.

4

There is something that does not let you install the latest verison of Permutations.jl (0.4.0). The error message you are receiving tells:

possible versions are: 0.3.0-0.3.2 or uninstalled

Those versions are not compatible with Combinatorics 1.0 (besides being quite old), so you can’t install it along with it.

There may be another package in your environment that – directly or indirectly – does not allow Permutations 0.4.0. You may try in a new environment

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