# Trying to use another solver with Ipopt.jl besides Mumps

**URL:** <https://discourse.julialang.org/t/trying-to-use-another-solver-with-ipopt-jl-besides-mumps/22426>\
**Category:** Optimization (Mathematical)\
**Created:** [March 27, 2019, 6:56pm UTC](https://discourse.julialang.org/t/trying-to-use-another-solver-with-ipopt-jl-besides-mumps/22426 "2019-03-27T18:56:29Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![pedrohvbsilva](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/pedrohvbsilva/32/12524_2.png) [@pedrohvbsilva](https://discourse.julialang.org/u/pedrohvbsilva)\
**Post date:** [March 27, 2019, 6:56pm UTC](https://discourse.julialang.org/t/trying-to-use-another-solver-with-ipopt-jl-besides-mumps/22426/1 "2019-03-27T18:56:29Z")

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I’ve been trying to use Pardiso as linear solver in one of my programs, i have a academic license of Pardiso, and try to put de libpardiso.dll, in Ipopt.jl package dir. I’m using Julia 1.1.0, JuMP v0.19 and Windows 10.

model = Model(with\_optimizer(Ipopt.Optimizer,linear\_solver=“pardiso”))

but i receved this statment:

Exception of type: OPTION\_INVALID in file “…/…/…/…/Ipopt/src/Algorithm/IpAlgBuilder.cpp” at line 366:  
Exception message: Selected linear solver Pardiso not available.  
Tried to obtain Pardiso from shared library “libpardiso.dll”, but the following error occured:  
Windows error while loading dynamic library libpardiso.dll, error = 126.  
(see [Tutorial - Debug system error codes - Win32 apps | Microsoft Docs](http://msdn.microsoft.com/en-us/library/ms681381%28v=vs.85%29.aspx))

Trying to figure out were to insert the libpardiso.dll