# Umpfack error in heat conduction problem

**URL:** <https://community.freefem.org/t/umpfack-error-in-heat-conduction-problem/1004>\
**Category:** General Discussion\
**Created:** [June 2, 2021, 2:45pm UTC](https://community.freefem.org/t/umpfack-error-in-heat-conduction-problem/1004 "2021-06-02T14:45:36Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![chaimaa](https://avatars.discourse-cdn.com/v4/letter/c/c0e974/32.png) [@chaimaa](https://community.freefem.org/u/chaimaa)\
**Post date:** [June 2, 2021, 2:45pm UTC](https://community.freefem.org/t/umpfack-error-in-heat-conduction-problem/1004/1 "2021-06-02T14:45:36Z")

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i m trying to solve a problem of heat conduction and i use in first the umpfach solver but it give this error :  
Error umpfack umfpack\_di\_numeric status 1  
Error umfpack\_di\_solve status 1  
version de medit ffmedit.exe -popen -filebin -addsol 1 Th  
– Medit, Release 3.0a (Nov. 30, 2007)  
Copyright (c) LJLL, 1999-2007.  
compiled: Fri, Sep 04, 2020 2:13:16 AM (with ff++ 4.7).

medit with binary version of popen : mesh(es) and solution(s)  
mesh\_name= Th  
Loading data file(s)  
End of mesh  
.sol: Dimension 3 (mesh)3 (lecture)1  
Input seconds: 0.11

medit1()

Building scene(s)  
Creating scene 1  
Loading default options  
Scene seconds: 0.20

Rendering scene(s)

Total running seconds: 2.84  
Thank you for using Medit.  
nan

this problem occurs only with i use p2 element type with a refined mesh .

thank you.

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<div class="post-metadata">

**Author:** ![henkel](https://avatars.discourse-cdn.com/v4/letter/h/b77776/32.png) [@henkel](https://community.freefem.org/u/henkel)\
**Post date:** [June 2, 2021, 2:52pm UTC](https://community.freefem.org/t/umpfack-error-in-heat-conduction-problem/1004/2 "2021-06-02T14:52:23Z")

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Add `load "UMFPACK64"` and try again.