# meshL sequence does not exist

**URL:** <https://community.freefem.org/t/meshl-sequence-does-not-exist/2512>\
**Category:** FreeFEM installation\
**Created:** [May 31, 2023, 12:19pm UTC](https://community.freefem.org/t/meshl-sequence-does-not-exist/2512 "2023-05-31T12:19:28Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![arallu](https://avatars.discourse-cdn.com/v4/letter/a/e495f1/32.png) [@arallu](https://community.freefem.org/u/arallu)\
**Post date:** [May 31, 2023, 12:19pm UTC](https://community.freefem.org/t/meshl-sequence-does-not-exist/2512/1 "2023-05-31T12:19:28Z")

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Hello,

I wanted to solve1D FE problem, for this purpose I have tested the very simple program :

meshL Th=segment(10) ;  
plot(Th,wait=1);

An error message appears : “The Identifier segment does not exist”. I am working with FreeFEM v4.12 (the last version I suppose). What is wrong?

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<div class="post-metadata">

**Author:** ![frederichecht](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.freefem.org/frederichecht/32/15_2.png) [@frederichecht](https://community.freefem.org/u/frederichecht)\
**Post date:** [June 2, 2023, 6:36am UTC](https://community.freefem.org/t/meshl-sequence-does-not-exist/2512/2 "2023-06-02T06:36:55Z")

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You have to use

```auto
 load "msh3" 

```

before in the script.

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<div class="post-metadata">

**Author:** ![arallu](https://avatars.discourse-cdn.com/v4/letter/a/e495f1/32.png) [@arallu](https://community.freefem.org/u/arallu)\
**Post date:** [June 6, 2023, 7:17am UTC](https://community.freefem.org/t/meshl-sequence-does-not-exist/2512/3 "2023-06-06T07:17:17Z")

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Thanks, the confusing point is msh3 lets think to 3D mesh.