# Ipopt Windows Error

**URL:** <https://discourse.julialang.org/t/ipopt-windows-error/1504>\
**Category:** Optimization (Mathematical)\
**Tags:** jump\
**Created:** [January 16, 2017, 4:11am UTC](https://discourse.julialang.org/t/ipopt-windows-error/1504 "2017-01-16T04:11:39Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![deepakagrawal](https://avatars.discourse-cdn.com/v4/letter/d/7c8e57/32.png) [@deepakagrawal](https://discourse.julialang.org/u/deepakagrawal)\
**Post date:** [January 16, 2017, 4:11am UTC](https://discourse.julialang.org/t/ipopt-windows-error/1504/1 "2017-01-16T04:11:39Z")

</div>

I got following error when using IpoptSolver on windows. I also tried running Pkg.test(“Ipopt”) and got similar error.

```julia
LoadError: ReadOnlyMemoryError()
 in solveProblem(::Ipopt.IpoptProblem) at C:\Users\agraw\.julia\v0.5\Ipopt\src\Ipopt.jl:304
 in optimize!(::Ipopt.IpoptMathProgModel) at C:\Users\agraw\.julia\v0.5\Ipopt\src\IpoptSolverInterface.jl:120
 in optimize!(::MathProgBase.SolverInterface.NonlinearToLPQPBridge) at C:\Users\agraw\.julia\v0.5\MathProgBase\src\SolverInterface\nonlinear_to_lpqp.jl:71
 in #solve#97(::Bool, ::Bool, ::Bool, ::Array{Any,1}, ::Function, ::JuMP.Model) at C:\Users\agraw\.julia\v0.5\JuMP\src\solvers.jl:142
 in solve(::JuMP.Model) at C:\Users\agraw\.julia\v0.5\JuMP\src\solvers.jl:117
 in include_string(::String, ::String) at .\loading.jl:441
 in include_string(::Module, ::String, ::String) at C:\Users\agraw\.julia\v0.5\CodeTools\src\eval.jl:32
 in (::Atom.##61#64{String,String})() at C:\Users\agraw\.julia\v0.5\Atom\src\eval.jl:81
 in withpath(::Atom.##61#64{String,String}, ::String) at C:\Users\agraw\.julia\v0.5\CodeTools\src\utils.jl:30
 in withpath(::Function, ::String) at C:\Users\agraw\.julia\v0.5\Atom\src\eval.jl:46
 in macro expansion at C:\Users\agraw\.julia\v0.5\Atom\src\eval.jl:79 [inlined]
 in (::Atom.##60#63{String,String})() at .\task.jl:60
while loading C:\Users\agraw\Downloads\testIpopt.jl, in expression starting on line 12

```

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<div class="post-metadata">

**Author:** ![ccoffrin](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/ccoffrin/32/400_2.png) [@ccoffrin](https://discourse.julialang.org/u/ccoffrin)\
**Post date:** [January 16, 2017, 4:28am UTC](https://discourse.julialang.org/t/ipopt-windows-error/1504/2 "2017-01-16T04:28:47Z")

</div>

I can confirm the same issue on another system.

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<div class="post-metadata">

**Author:** ![ihnorton](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/ihnorton/32/26_2.png) [@ihnorton](https://discourse.julialang.org/u/ihnorton)\
**Post date:** [January 16, 2017, 6:34am UTC](https://discourse.julialang.org/t/ipopt-windows-error/1504/3 "2017-01-16T06:34:54Z")

</div>

xref  
[https://github.com/JuliaOpt/Ipopt.jl/issues/77](https://github.com/JuliaOpt/Ipopt.jl/issues/77)