# using JuMP - LoadError: UndefVarError: start not defined

**URL:** <https://discourse.julialang.org/t/using-jump-loaderror-undefvarerror-start-not-defined/13853>\
**Category:** General Usage\
**Tags:** bug\
**Created:** [August 21, 2018, 8:20pm UTC](https://discourse.julialang.org/t/using-jump-loaderror-undefvarerror-start-not-defined/13853 "2018-08-21T20:20:02Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Stefano\_C](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/stefano_c/32/5080_2.png) [@Stefano\_C](https://discourse.julialang.org/u/Stefano_C)\
**Post date:** [August 21, 2018, 8:20pm UTC](https://discourse.julialang.org/t/using-jump-loaderror-undefvarerror-start-not-defined/13853/1 "2018-08-21T20:20:02Z")

</div>

Hello,

I’ve just installed julia 1.0.0. When running “using JuMP” I get the following error:  
[Info: Precompiling JuMP [4076af6c-e467-56ae-b986-b466b2749572]  
ERROR: LoadError: LoadError: UndefVarError: start not defined  
Stacktrace:  
[1] getproperty(::Module, ::Symbol) at ./sysimg.jl:13  
[2] top-level scope at none:0  
[3] include at ./boot.jl:317 [inlined]  
[4] include\_relative(::Module, ::String) at ./loading.jl:1038  
[5] include at ./sysimg.jl:29 [inlined]  
[6] include(::String) at /home/stefano/.julia/packages/ForwardDiff/2v3a4/src/ForwardDiff.jl:3  
[7] top-level scope at none:0  
[8] include at ./boot.jl:317 [inlined]  
[9] include\_relative(::Module, ::String) at ./loading.jl:1038  
[10] include(::Module, ::String) at ./sysimg.jl:29  
[11] top-level scope at none:2  
[12] eval at ./boot.jl:319 [inlined]  
[13] eval(::Expr) at ./client.jl:389  
[14] top-level scope at ./none:3  
in expression starting at /home/stefano/.julia/packages/ForwardDiff/2v3a4/src/partials.jl:25  
in expression starting at /home/stefano/.julia/packages/ForwardDiff/2v3a4/src/ForwardDiff.jl:16  
ERROR: LoadError: Failed to precompile ForwardDiff [f6369f11-7733-5829-9624-2563aa707210] to /home/stefano/.julia/compiled/v1.0/ForwardDiff/k0ETY.ji.  
Stacktrace:  
[1] error(::String) at ./error.jl:33  
[2] macro expansion at ./logging.jl:313 [inlined]  
[3] compilecache(::Base.PkgId, ::String) at ./loading.jl:1184  
[4] \_require(::Base.PkgId) at ./logging.jl:311  
[5] require(::Base.PkgId) at ./loading.jl:852  
[6] macro expansion at ./logging.jl:311 [inlined]  
[7] require(::Module, ::Symbol) at ./loading.jl:834  
[8] include at ./boot.jl:317 [inlined]  
[9] include\_relative(::Module, ::String) at ./loading.jl:1038  
[10] include(::Module, ::String) at ./sysimg.jl:29  
[11] top-level scope at none:2  
[12] eval at ./boot.jl:319 [inlined]  
[13] eval(::Expr) at ./client.jl:389  
[14] top-level scope at ./none:3  
in expression starting at /home/stefano/.julia/packages/ReverseDiffSparse/bP6lF/src/ReverseDiffSparse.jl:4  
ERROR: LoadError: Failed to precompile ReverseDiffSparse [89212889-6d3f-5f97-b412-7825138f6c9c] to /home/stefano/.julia/compiled/v1.0/ReverseDiffSparse/VqGhr.ji.  
Stacktrace:  
[1] error(::String) at ./error.jl:33  
[2] macro expansion at ./logging.jl:313 [inlined]  
[3] compilecache(::Base.PkgId, ::String) at ./loading.jl:1184  
[4] \_require(::Base.PkgId) at ./logging.jl:311  
[5] require(::Base.PkgId) at ./loading.jl:852  
[6] macro expansion at ./logging.jl:311 [inlined]  
[7] require(::Module, ::Symbol) at ./loading.jl:834  
[8] include at ./boot.jl:317 [inlined]  
[9] include\_relative(::Module, ::String) at ./loading.jl:1038  
[10] include(::Module, ::String) at ./sysimg.jl:29  
[11] top-level scope at none:2  
[12] eval at ./boot.jl:319 [inlined]  
[13] eval(::Expr) at ./client.jl:389  
[14] top-level scope at ./none:3  
in expression starting at /home/stefano/.julia/packages/JuMP/6aWuF/src/JuMP.jl:20  
ERROR: Failed to precompile JuMP [4076af6c-e467-56ae-b986-b466b2749572] to /home/stefano/.julia/compiled/v1.0/JuMP/DmXqY.ji.  
Stacktrace:  
[1] error(::String) at ./error.jl:33  
[2] macro expansion at ./logging.jl:313 [inlined]  
[3] compilecache(::Base.PkgId, ::String) at ./loading.jl:1184  
[4] \_require(::Base.PkgId) at ./logging.jl:311  
[5] require(::Base.PkgId) at ./loading.jl:852  
[6] macro expansion at ./logging.jl:311 [inlined]  
[7] require(::Module, ::Symbol) at ./loading.jl:834

Any idea?

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<div class="post-metadata">

**Author:** ![ExpandingMan](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/expandingman/32/866_2.png) [@ExpandingMan](https://discourse.julialang.org/u/ExpandingMan)\
**Post date:** [August 21, 2018, 8:41pm UTC](https://discourse.julialang.org/t/using-jump-loaderror-undefvarerror-start-not-defined/13853/2 "2018-08-21T20:41:13Z")

</div>

Please see [this announcement](https://discourse.julialang.org/t/jump-and-julia-0-7-1-0/12964) regarding the status of JuMP on 1.0.

The development version of JuMP is working on 1.0, so if you are feeling adventurous you can try using `dev JuMP`. Be advised however, that it is very much still in development.

In some other good news, I am very nearly done getting JuMP 0.18 to run on 1.0, so you should have it fairly soon. If you want to track the status see [this](https://github.com/JuliaOpt/JuMP.jl/pull/1432) PR.

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**Author:** ![Stefano\_C](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/stefano_c/32/5080_2.png) [@Stefano\_C](https://discourse.julialang.org/u/Stefano_C)\
**Post date:** [August 21, 2018, 9:20pm UTC](https://discourse.julialang.org/t/using-jump-loaderror-undefvarerror-start-not-defined/13853/3 "2018-08-21T21:20:11Z")

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Hello, thank you for the answer.  
I’m not sure how to actually select dev JuMP.

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<div class="post-metadata">

**Author:** ![ExpandingMan](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/expandingman/32/866_2.png) [@ExpandingMan](https://discourse.julialang.org/u/ExpandingMan)\
**Post date:** [August 21, 2018, 10:19pm UTC](https://discourse.julialang.org/t/using-jump-loaderror-undefvarerror-start-not-defined/13853/4 "2018-08-21T22:19:29Z")

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You can just do `]dev JuMP` in the REPL.

Before experimenting with that I’d recommend familiarizing yourself with the [Pkg documentation](https://docs.julialang.org/en/stable/stdlib/Pkg/) a bit.

If you are looking for a stable, usable linear or quadratic programming interface on 1.0, you’ll just have to wait a bit, though hopefully it won’t be too long now.

If you are working on non-linear programs I also recommend checking out [Optim.jl](https://github.com/JuliaNLSolvers/Optim.jl) which is now fully 1.0 ready.