# CPLEX install in Julia

**URL:** <https://discourse.julialang.org/t/cplex-install-in-julia/44724>\
**Category:** General Usage\
**Tags:** question\
**Created:** [August 11, 2020, 4:35am UTC](https://discourse.julialang.org/t/cplex-install-in-julia/44724 "2020-08-11T04:35:29Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![dty](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/dty/32/16885_2.png) [@dty](https://discourse.julialang.org/u/dty)\
**Post date:** [August 11, 2020, 4:35am UTC](https://discourse.julialang.org/t/cplex-install-in-julia/44724/1 "2020-08-11T04:35:29Z")

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First of all, I’ll follow Julia’s instructions CPLEX.jl Add environment statement in

```julia
ENV["CPLEX_STUDIO_BINARIES"] = "C:/IBM/CPLEX_Studio128/cplex/bin/x64_win64"

```

The error report is as follows

```julia
ERROR: Failed to precompile CPLEX [a076750e-1247-5638-91d2-ce28b192dca0] to C:\Users\61940\.juliapro\JuliaPro_v1.4.2-1\compiled\v1.4\CPLEX\QpT0w_qertE.ji.
Stacktrace:
 [1] error(::String) at .\error.jl:33
 [2] compilecache(::Base.PkgId, ::String) at .\loading.jl:1272
 [3] _require(::Base.PkgId) at .\loading.jl:1029
 [4] require(::Base.PkgId) at .\loading.jl:927
 [5] require(::Module, ::Symbol) at .\loading.jl:922

```

Please help me. Why can’t I use it

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<div class="post-metadata">

**Author:** ![dty](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/dty/32/16885_2.png) [@dty](https://discourse.julialang.org/u/dty)\
**Post date:** [August 11, 2020, 8:38am UTC](https://discourse.julialang.org/t/cplex-install-in-julia/44724/2 "2020-08-11T08:38:43Z")

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julia\> Pkg.build(“CPLEX”)  
Building CPLEX → `C:\Users\61940\.juliapro\JuliaPro_v1.4.2-1\packages\CPLEX\Hxpuk\deps\build.log`  
┌ Error: Error building `CPLEX`:  
│ ��Ϣ: ���ṩ��ģʽ�޷��ҵ��ļ�  
│ ERROR: LoadError: Unable to locate CPLEX installation. Note this must be downloaded separately. See the CPLEX.jl README for further instructions.  
│ Stacktrace:  
│ [1] error(::String) at .\error.jl:33  
│ [2] try\_local\_installation() at C:\Users\61940.juliapro\JuliaPro\_v1.4.2-1\packages\CPLEX\Hxpuk\deps\build.jl:64  
│ [3] top-level scope at C:\Users\61940.juliapro\JuliaPro\_v1.4.2-1\packages\CPLEX\Hxpuk\deps\build.jl:80  
│ [4] include(::String) at .\client.jl:439  
│ [5] top-level scope at none:5  
│ in expression starting at C:\Users\61940.juliapro\JuliaPro\_v1.4.2-1\packages\CPLEX\Hxpuk\deps\build.jl:77  
└ @ Pkg.Operations C:\Users\julia\AppData\Local\Julia-1.4.2\share\julia\stdlib\v1.4\Pkg\src\Operations.jl:892

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**Author:** ![dty](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/dty/32/16885_2.png) [@dty](https://discourse.julialang.org/u/dty)\
**Post date:** [August 11, 2020, 8:39am UTC](https://discourse.julialang.org/t/cplex-install-in-julia/44724/3 "2020-08-11T08:39:50Z")

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I’m CPLEX version 12.10 just installed today