# I'm having trouble installing GPLK
**URL:** https://discourse.julialang.org/t/im-having-trouble-installing-gplk/107195
**Category:** Optimization (Mathematical)
**Tags:** package
**Created:** [December 6, 2023, 4:58am UTC](https://discourse.julialang.org/t/im-having-trouble-installing-gplk/107195 "2023-12-06T04:58:07Z")
**Posts on this page:** 8
**Page:** 1
### Author:  [@doriiido](https://discourse.julialang.org/u/doriiido)
#### Post date: [December 6, 2023, 4:58am UTC](https://discourse.julialang.org/t/im-having-trouble-installing-gplk/107195/1 "2023-12-06T04:58:07Z")
I’m fairly new to Julia, I’m trying to install GPLK package but this erroe keeps showing up:
(@v1.6) pkg\> add GPLK
Updating registry at `C:\Users\doriiido\.julia\registries\General`
Updating git-repo `https://github.com/JuliaRegistries/General.git`
ERROR: The following package names could not be resolved:
- GPLK (not found in project, manifest or registry)
Stacktrace:
[1] pkgerror(msg::String)
@ Pkg.Types C:\buildbot\worker\package\_win64\build\usr\share\julia\stdlib\v1.6\Pkg\src\Types.jl:55
[2] ensure\_resolved(ctx::Pkg.Types.Context, pkgs::Vector{Pkg.Types.PackageSpec}; registry::Bool)
@ Pkg.Types C:\buildbot\worker\package\_win64\build\usr\share\julia\stdlib\v1.6\Pkg\src\Types.jl:883
[3] add(ctx::Pkg.Types.Context, pkgs::Vector{Pkg.Types.PackageSpec}; preserve::Pkg.Types.PreserveLevel, platform::Base.BinaryPlatforms.Platform, kwargs::Base.Iterators.Pairs{Symbol, Base.TTY, Tuple{Symbol}, NamedTuple{(:io,), Tuple{Base.TTY}}})
@ Pkg.API C:\buildbot\worker\package\_win64\build\usr\share\julia\stdlib\v1.6\Pkg\src\API.jl:193
[4] add(pkgs::Vector{Pkg.Types.PackageSpec}; io::Base.TTY, kwargs::Base.Iterators.Pairs{Union{}, Union{}, Tuple{}, NamedTuple{(), Tuple{}}})
@ Pkg.API C:\buildbot\worker\package\_win64\build\usr\share\julia\stdlib\v1.6\Pkg\src\API.jl:80
[5] add(pkgs::Vector{Pkg.Types.PackageSpec})
@ Pkg.API C:\buildbot\worker\package\_win64\build\usr\share\julia\stdlib\v1.6\Pkg\src\API.jl:78
[6] #add#23
@ C:\buildbot\worker\package\_win64\build\usr\share\julia\stdlib\v1.6\Pkg\src\API.jl:76 [inlined]
[7] add
@ C:\buildbot\worker\package\_win64\build\usr\share\julia\stdlib\v1.6\Pkg\src\API.jl:76 [inlined]
[8] #add#22
@ C:\buildbot\worker\package\_win64\build\usr\share\julia\stdlib\v1.6\Pkg\src\API.jl:75 [inlined]
[9] add(pkg::String)
@ Pkg.API C:\buildbot\worker\package\_win64\build\usr\share\julia\stdlib\v1.6\Pkg\src\API.jl:75
[10] top-level scope
@ Untitled-1:2
Can anyone help me with this? I’m having the same issues ot install cbc or CPLEX
---
### Author:  [@nsajko](https://discourse.julialang.org/u/nsajko)
#### Post date: [December 6, 2023, 5:05am UTC](https://discourse.julialang.org/t/im-having-trouble-installing-gplk/107195/2 "2023-12-06T05:05:54Z")
It’s not “GPLK”, it’s “GLPK” (GLPK.jl).
---
### Author:  [@mkitti](https://discourse.julialang.org/u/mkitti)
#### Post date: [December 6, 2023, 5:06am UTC](https://discourse.julialang.org/t/im-having-trouble-installing-gplk/107195/3 "2023-12-06T05:06:54Z")
Also is there a particular reason you are using Julia 1.6?
---
### Author:  [@doriiido](https://discourse.julialang.org/u/doriiido)
#### Post date: [December 6, 2023, 5:22am UTC](https://discourse.julialang.org/t/im-having-trouble-installing-gplk/107195/4 "2023-12-06T05:22:50Z")
I’m not sure. I just downloaded Julia and installed for an optimization course I’m doing. What should I be using instead?
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### Author:  [@doriiido](https://discourse.julialang.org/u/doriiido)
#### Post date: [December 6, 2023, 5:24am UTC](https://discourse.julialang.org/t/im-having-trouble-installing-gplk/107195/5 "2023-12-06T05:24:19Z")
Thanks, I tried this just now but I got the following:
ERROR: UndefVarError: GPLK not defined
Stacktrace:
[1] top-level scope
@ Untitled-1:2
This is what I entered:
Pkg.add(GPLK.jl)
I also tried Pkg.add(“GPLK”) as the documentation stated.
And I tried:
(@v1.6) pkg\> add “GPLK”(GPLK.jl)
ERROR: Unable to parse `(GPLK.jl)` as a package.
(@v1.6) pkg\> add “GPLK”
ERROR: The following package names could not be resolved:
- GPLK (not found in project, manifest or registry)
---
### Author:  [@odow](https://discourse.julialang.org/u/odow)
#### Post date: [December 6, 2023, 5:30am UTC](https://discourse.julialang.org/t/im-having-trouble-installing-gplk/107195/6 "2023-12-06T05:30:05Z")
Its GLPK. Note the L before the P.
And Julia 1.6 is fine to use.
---
### Author:  [@doriiido](https://discourse.julialang.org/u/doriiido)
#### Post date: [December 6, 2023, 5:30am UTC](https://discourse.julialang.org/t/im-having-trouble-installing-gplk/107195/7 "2023-12-06T05:30:50Z")
apologies, I did not notice the misspelling
---
### Author:  [@doriiido](https://discourse.julialang.org/u/doriiido)
#### Post date: [December 6, 2023, 5:31am UTC](https://discourse.julialang.org/t/im-having-trouble-installing-gplk/107195/8 "2023-12-06T05:31:25Z")
Thank you kindly