# VTK output problem

**URL:** <https://community.freefem.org/t/vtk-output-problem/606>\
**Category:** General Discussion\
**Created:** [October 8, 2020, 5:08pm UTC](https://community.freefem.org/t/vtk-output-problem/606 "2020-10-08T17:08:36Z")\
**Posts on this page:** 1\
**Showing post:** 4

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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:** [October 11, 2020, 6:14pm UTC](https://community.freefem.org/t/vtk-output-problem/606/4 "2020-10-11T18:14:58Z")

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Change the `.vtk` extension to `.vtu`. Does this fix your issue?

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_[View the full topic](https://community.freefem.org/t/vtk-output-problem/606)._