# Error using meshL, segment, msh3 **URL:** \ **Category:** General Discussion\ **Created:** [February 13, 2025, 8:20pm UTC](https://community.freefem.org/t/error-using-meshl-segment-msh3/3745 "2025-02-13T20:20:55Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![natasha](https://avatars.discourse-cdn.com/v4/letter/n/df705f/32.png) [@natasha](https://community.freefem.org/u/natasha)\ **Post date:** [February 13, 2025, 8:20pm UTC](https://community.freefem.org/t/error-using-meshl-segment-msh3/3745/1 "2025-02-13T20:20:55Z")
When trying to integrate on an interval using int1D, I get the following error message because meshL command doesn’t work even with load “msh3”, load “medit”. ```auto meshL The Identifier meshL does not exist ``` How to properly build a meshL object when these commands, as well as “segment”, do not work. The version I have is FreeFem+±cs 14.3 on Windows 11. ---
**Author:** ![alh](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.freefem.org/alh/32/2354_2.png) [@alh](https://community.freefem.org/u/alh)\ **Post date:** [February 13, 2025, 11:32pm UTC](https://community.freefem.org/t/error-using-meshl-segment-msh3/3745/2 "2025-02-13T23:32:14Z")
You just need to upgrade FreeFEM-cs. There are two ways: - get a new version of FreeFEM-cs from [https://www.ljll.fr/lehyaric/ffcs/](https://www.ljll.fr/lehyaric/ffcs/) - or, if you want to keep your current interface, you can install a new version of FreeFEM from [https://freefem.org/](https://freefem.org/) and click “Compute/Use External FreeFEM” in FreeFEM-cs Please let us know how it goes. ---
**Author:** ![natasha](https://avatars.discourse-cdn.com/v4/letter/n/df705f/32.png) [@natasha](https://community.freefem.org/u/natasha)\ **Post date:** [February 17, 2025, 9:42pm UTC](https://community.freefem.org/t/error-using-meshl-segment-msh3/3745/3 "2025-02-17T21:42:14Z")
The solution worked, thank you!