# BuildMesh Error

**URL:** <https://community.freefem.org/t/buildmesh-error/3485>\
**Category:** General Discussion\
**Created:** [September 13, 2024, 6:22am UTC](https://community.freefem.org/t/buildmesh-error/3485 "2024-09-13T06:22:21Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![MariamiMamgo](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.freefem.org/mariamimamgo/32/2641_2.png) [@MariamiMamgo](https://community.freefem.org/u/MariamiMamgo)\
**Post date:** [September 13, 2024, 6:22am UTC](https://community.freefem.org/t/buildmesh-error/3485/1 "2024-09-13T06:22:21Z")

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Hello,  
I’m encountering a problem when using the `buildmesh` function in FreeFem++, which is causing a bug during execution. Additionally, I tried to use a `try-catch` block to handle the error, but it doesn’t seem to work as expected.  
Could anyone help me understand why this issue occurs with `buildmesh`, and why the `try-catch` block is not able to catch the error?  
Thanks in advance for your help!  
try {  
Th = buildmesh(bound0(-meshsize1) + bound1(meshsize1) + bound2(meshsize1) + bound3(meshsize1) + bound4(meshsize2) + bound5(meshsize2));  
} The error message states that some vertices are missing, but since this is an error, I expected it to be caught by the `catch` block. However, the code does not seem to move into the `catch` block when the error occurs.