# PETSc error of ChangeNumbering

**URL:** <https://community.freefem.org/t/petsc-error-of-changenumbering/2509>\
**Category:** General Discussion\
**Created:** [May 29, 2023, 3:51pm UTC](https://community.freefem.org/t/petsc-error-of-changenumbering/2509 "2023-05-29T15:51:21Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![prj](https://avatars.discourse-cdn.com/v4/letter/p/ecae2f/32.png) [@prj](https://community.freefem.org/u/prj)\
**Post date:** [May 29, 2023, 4:05pm UTC](https://community.freefem.org/t/petsc-error-of-changenumbering/2509/2 "2023-05-29T16:05:39Z")

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You need to call `buildDmesh()` before you define your local `fespace` named `SpaceVector`.

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_[View the full topic](https://community.freefem.org/t/petsc-error-of-changenumbering/2509)._