# HiGHS OTHER\_ERROR

**URL:** <https://discourse.julialang.org/t/highs-other-error/134521>\
**Category:** Optimization (Mathematical)\
**Tags:** question, highs\
**Created:** [December 12, 2025, 4:37pm UTC](https://discourse.julialang.org/t/highs-other-error/134521 "2025-12-12T16:37:40Z")\
**Posts on this page:** 17\
**Page:** 1

<div class="post-metadata">

**Author:** ![ohmsweetohm1](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/ohmsweetohm1/32/49126_2.png) [@ohmsweetohm1](https://discourse.julialang.org/u/ohmsweetohm1)\
**Post date:** [December 12, 2025, 4:37pm UTC](https://discourse.julialang.org/t/highs-other-error/134521/1 "2025-12-12T16:37:40Z")

</div>

What does this mean? Is it infeasible, is it solved? Thx

```txt
Running HiGHS 1.12.0 (git hash: 755a8e027a): Copyright (c) 2025 HiGHS under MIT licence terms
LP has 4246 rows; 3330 cols; 15361 nonzeros
Coefficient ranges:
  Matrix [1e-01, 2e+03]
  Cost [9e-04, 4e+07]
  Bound [1e-01, 4e+02]
  RHS [1e+00, 1e+01]
WARNING: Problem has some excessively large costs
WARNING: Consider scaling the objective by 1e-2, or setting the user_objective_scale option to -6
Solving LP with useful basis so presolve not used
Using EKK dual simplex solver - serial
  Iteration Objective Infeasibilities num(sum)
          0 -8.5248019006e+03 Ph1: 333(469037); Du: 74(8.5267) 0s
       2914 2.1700895546e+14 Pr: 751(3.00469e+17) 5s
Model status : Not Set
HiGHS run time : 5.05

```

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<div class="post-metadata">

**Author:** ![blegat](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/blegat/32/217090_2.png) [@blegat](https://discourse.julialang.org/u/blegat)\
**Post date:** [December 12, 2025, 4:42pm UTC](https://discourse.julialang.org/t/highs-other-error/134521/2 "2025-12-12T16:42:58Z")

</div>

Maybe it gave up because of the reason explained in the warnings ?

```julia-auto
WARNING: Problem has some excessively large costs
WARNING: Consider scaling the objective by 1e-2, or setting the user_objective_scale option to -6

```

---

<div class="post-metadata">

**Author:** ![ohmsweetohm1](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/ohmsweetohm1/32/49126_2.png) [@ohmsweetohm1](https://discourse.julialang.org/u/ohmsweetohm1)\
**Post date:** [December 12, 2025, 5:13pm UTC](https://discourse.julialang.org/t/highs-other-error/134521/3 "2025-12-12T17:13:38Z")

</div>

Applied the option it suggested. Now it complains that the cost is very small, but it solves it.

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<div class="post-metadata">

**Author:** ![odow](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/odow/32/28685_2.png) [@odow](https://discourse.julialang.org/u/odow)\
**Post date:** [December 12, 2025, 6:24pm UTC](https://discourse.julialang.org/t/highs-other-error/134521/4 "2025-12-12T18:24:02Z")

</div>

Can you share a reproducible example or the MPS file?

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<div class="post-metadata">

**Author:** ![ohmsweetohm1](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/ohmsweetohm1/32/49126_2.png) [@ohmsweetohm1](https://discourse.julialang.org/u/ohmsweetohm1)\
**Post date:** [December 12, 2025, 8:39pm UTC](https://discourse.julialang.org/t/highs-other-error/134521/5 "2025-12-12T20:39:24Z")

</div>

Sure

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<div class="post-metadata">

**Author:** ![odow](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/odow/32/28685_2.png) [@odow](https://discourse.julialang.org/u/odow)\
**Post date:** [December 12, 2025, 8:45pm UTC](https://discourse.julialang.org/t/highs-other-error/134521/6 "2025-12-12T20:45:27Z")

</div>

What’s the output of `solution_summary`? Something weird happened with the status not set. Looks like a bug we can fix

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<div class="post-metadata">

**Author:** ![ohmsweetohm1](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/ohmsweetohm1/32/49126_2.png) [@ohmsweetohm1](https://discourse.julialang.org/u/ohmsweetohm1)\
**Post date:** [December 14, 2025, 10:37am UTC](https://discourse.julialang.org/t/highs-other-error/134521/7 "2025-12-14T10:37:16Z")

</div>

```txt
solution_summary(; result = 1, verbose = false)
├ solver_name : HiGHS
├ Termination
│ ├ termination_status : OTHER_ERROR
│ ├ result_count : 0
│ ├ raw_status : There was an error calling optimize!
│ └ objective_bound : 0.00000e+00
├ Solution (result = 1)
│ ├ primal_status : NO_SOLUTION
│ ├ dual_status : NO_SOLUTION
│ └ relative_gap : 0.00000e+00
└ Work counters
  ├ solve_time (sec) : 1.36276e+00
  ├ simplex_iterations : 0
  ├ barrier_iterations : 0
  └ node_count : 0

```

---

<div class="post-metadata">

**Author:** ![ohmsweetohm1](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/ohmsweetohm1/32/49126_2.png) [@ohmsweetohm1](https://discourse.julialang.org/u/ohmsweetohm1)\
**Post date:** [December 14, 2025, 10:49am UTC](https://discourse.julialang.org/t/highs-other-error/134521/8 "2025-12-14T10:49:23Z")

</div>

I created an issue here: [OTHER\_ERROR for model · Issue #316 · jump-dev/HiGHS.jl · GitHub](https://github.com/jump-dev/HiGHS.jl/issues/316)  
Thx for looking into it.

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<div class="post-metadata">

**Author:** ![ohmsweetohm1](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/ohmsweetohm1/32/49126_2.png) [@ohmsweetohm1](https://discourse.julialang.org/u/ohmsweetohm1)\
**Post date:** [December 14, 2025, 10:58am UTC](https://discourse.julialang.org/t/highs-other-error/134521/9 "2025-12-14T10:58:30Z")

</div>

This looks weird as well.  
How can it be `OPTIMAL` when it is an `INFEASIBLE_POINT`?

```txt
solution_summary(; result = 1, verbose = false)
├ solver_name : HiGHS
├ Termination
│ ├ termination_status : OPTIMAL
│ ├ result_count : 1
│ ├ raw_status : kHighsModelStatusOptimal
│ └ objective_bound : 1.70224e-04
├ Solution (result = 1)
│ ├ primal_status : INFEASIBLE_POINT
│ ├ dual_status : NO_SOLUTION
│ ├ objective_value : 1.08943e-02
│ ├ dual_objective_value : NaN
│ └ relative_gap : 0.00000e+00
└ Work counters
  ├ solve_time (sec) : 7.68070e-02
  ├ simplex_iterations : 564
  ├ barrier_iterations : -1
  └ node_count : 1

```

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<div class="post-metadata">

**Author:** ![odow](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/odow/32/28685_2.png) [@odow](https://discourse.julialang.org/u/odow)\
**Post date:** [December 14, 2025, 9:28pm UTC](https://discourse.julialang.org/t/highs-other-error/134521/10 "2025-12-14T21:28:30Z")

</div>

> [@ohmsweetohm1](#):
>
> How can it be `OPTIMAL` when it is an `INFEASIBLE_POINT`?

This can happen when a solver solves the presolved model to optimality, but when it unscales the solution to the original user-space, the point is (slightly) infeasible. This is not specific to HiGHS (e.g., it also happens with [CPLEX](https://www.ibm.com/docs/en/cofz/22.1.2?topic=SS9UKU_22.1.2/com.ibm.cplex.zos.help/refcallablelibrary/macros/CPX_STAT_OPTIMAL_INFEAS.htm)) .

Maybe I need to write some proper documentation for this in the JuMP docs.

I’ll also discuss it with the HiGHS folks.

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**Author:** ![WalterMadelim](https://avatars.discourse-cdn.com/v4/letter/w/3e96dc/32.png) [@WalterMadelim](https://discourse.julialang.org/u/WalterMadelim)\
**Post date:** [December 15, 2025, 1:45am UTC](https://discourse.julialang.org/t/highs-other-error/134521/11 "2025-12-15T01:45:29Z")

</div>

> [@odow](#):
>
> Maybe I need to write some proper documentation for this in the JuMP docs.

JuMP’s solution\_summary has its own design such that it does not perfectly correspond to each solver. It this true?

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<div class="post-metadata">

**Author:** ![odow](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/odow/32/28685_2.png) [@odow](https://discourse.julialang.org/u/odow)\
**Post date:** [December 15, 2025, 2:15am UTC](https://discourse.julialang.org/t/highs-other-error/134521/12 "2025-12-15T02:15:55Z")

</div>

> Maybe I need to write some proper documentation for this in the JuMP docs

> <https://github.com/jump-dev/JuMP.jl/pull/4098>
>
> https://discourse.julialang.org/t/highs-other-error/134521/10?u=odow

`solution_summary` is just a helper function to print out different attributes.

> I have a question: what is the `dual_objective_value` below

Please start new questions instead of posting at the bottom of someone else’s thread.

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<div class="post-metadata">

**Author:** ![ohmsweetohm1](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/ohmsweetohm1/32/49126_2.png) [@ohmsweetohm1](https://discourse.julialang.org/u/ohmsweetohm1)\
**Post date:** [January 8, 2026, 7:18pm UTC](https://discourse.julialang.org/t/highs-other-error/134521/13 "2026-01-08T19:18:20Z")

</div>

I have another one do not quite get. This time it is even an LP:

```julia
Running HiGHS 1.12.0 (git hash: 755a8e027): Copyright (c) 2025 HiGHS under MIT licence terms
LP has 34868 rows; 20424 cols; 76248 nonzeros
Coefficient ranges:
  Matrix [2e-05, 1e+04]
  Cost [3e-02, 8e+01]
  Bound [1e+00, 1e+04]
  RHS [1e-04, 2e+03]
Presolving model
10532 rows, 10640 cols, 35504 nonzeros 0s
7908 rows, 8016 cols, 33259 nonzeros 0s
Dependent equations search running on 1790 equations with time limit of 6.00s
Dependent equations search removed 0 rows and 0 nonzeros in 0.00s (limit = 6.00s)
7718 rows, 7918 cols, 31688 nonzeros 0s
Presolve reductions: rows 7718(-27150); columns 7918(-12506); nonzeros 31688(-44560)
Solving the presolved LP
Using EKK dual simplex solver - serial
  Iteration Objective Infeasibilities num(sum)
          0 0.0000000000e+00 Ph1: 0(0) 0s
       7216 9.8156324683e+03 Pr: 0(0); Du: 0(1.34825e-12) 1s

Performed postsolve
Solving the original LP from the solution after postsolve

Model status : Optimal
Simplex iterations: 7216
Objective value : 9.8156324683e+03
P-D objective error : 7.4771018698e-14
HiGHS run time : 1.21
Running HiGHS 1.12.0 (git hash: 755a8e027): Copyright (c) 2025 HiGHS under MIT licence terms
LP has 34868 rows; 20424 cols; 76248 nonzeros
Coefficient ranges:
  Matrix [2e-05, 1e+04]
  Cost [3e-02, 8e+01]
  Bound [1e+00, 1e+04]
  RHS [1e-04, 2e+03]
Solving LP with useful basis so presolve not used
Using EKK dual simplex solver - serial
  Iteration Objective Infeasibilities num(sum)
          0 -1.5149276219e+09 Pr: 6560(2.11687e+13); Du: 0(3.14271e-07) 0s
Model status : Not Set
HiGHS run time : 0.24

│ solution_summary(; result = 1, verbose = false)
│ ├ solver_name : HiGHS
│ ├ Termination
│ │ ├ termination_status : OTHER_ERROR
│ │ ├ result_count : 0
│ │ ├ raw_status : There was an error calling optimize!
│ │ └ objective_bound : 0.00000e+00
│ ├ Solution (result = 1)
│ │ ├ primal_status : NO_SOLUTION
│ │ ├ dual_status : NO_SOLUTION
│ │ └ relative_gap : 0.00000e+00
│ └ Work counters
│ ├ solve_time (sec) : 2.42043e-01
│ ├ simplex_iterations : 0
│ ├ barrier_iterations : 0
│ └ node_count : 0

```

---

<div class="post-metadata">

**Author:** ![odow](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/odow/32/28685_2.png) [@odow](https://discourse.julialang.org/u/odow)\
**Post date:** [January 8, 2026, 7:28pm UTC](https://discourse.julialang.org/t/highs-other-error/134521/14 "2026-01-08T19:28:13Z")

</div>

Can you do

```Julia
HiGHS.Highs_writeModel(unsafe_backend(model), "model.mps")

```

and then send me the MPS?

Why are there two solves? Can you post a reproducible example?

---

<div class="post-metadata">

**Author:** ![ohmsweetohm1](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/ohmsweetohm1/32/49126_2.png) [@ohmsweetohm1](https://discourse.julialang.org/u/ohmsweetohm1)\
**Post date:** [January 8, 2026, 8:20pm UTC](https://discourse.julialang.org/t/highs-other-error/134521/15 "2026-01-08T20:20:30Z")

</div>

It’s an MPC test case, where I use the old solution as a starting value. Is that a hint?

Unfortunately I cannot supply a reproducible example. But maybe I get the error again and can provide an MPS - it is very sporadic. There are other things happening that influence the problem data, but I got this a few times earlier, so I am not sure.  
Is the JuMP MPS way also fine?

---

<div class="post-metadata">

**Author:** ![odow](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/odow/32/28685_2.png) [@odow](https://discourse.julialang.org/u/odow)\
**Post date:** [January 8, 2026, 9:47pm UTC](https://discourse.julialang.org/t/highs-other-error/134521/16 "2026-01-08T21:47:42Z")

</div>

> I use the old solution as a starting value. Is that a hint?

Hmm. This is probably why we couldn’t reproduce it in [OTHER\_ERROR for model · Issue #316 · jump-dev/HiGHS.jl · GitHub](https://github.com/jump-dev/HiGHS.jl/issues/316)

---

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**Author:** ![odow](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/odow/32/28685_2.png) [@odow](https://discourse.julialang.org/u/odow)\
**Post date:** [January 8, 2026, 9:49pm UTC](https://discourse.julialang.org/t/highs-other-error/134521/17 "2026-01-08T21:49:17Z")

</div>

It doesn’t need to be 100% reproducible. Even a script that sometimes triggers it is fine