# error when ExtractVisibleCells

**URL:** https://discourse.vtk.org/t/error-when-extractvisiblecells/7904
**Category:** Development
**Created:** [February 23, 2022, 12:30pm UTC](https://discourse.vtk.org/t/error-when-extractvisiblecells/7904 "2022-02-23T12:30:51Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![feierpusier](https://discourse.vtk.org/letter_avatar_proxy/v4/letter/f/c5a1d2/32.png) [@feierpusier](https://discourse.vtk.org/u/feierpusier)
#### Post date: [February 23, 2022, 12:30pm UTC](https://discourse.vtk.org/t/error-when-extractvisiblecells/7904/1 "2022-02-23T12:30:52Z")

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when I run [https://kitware.github.io/vtk-examples/site/Cxx/Filtering/ExtractVisibleCells/](https://kitware.github.io/vtk-examples/site/Cxx/Filtering/ExtractVisibleCells/) in Qt, the .exe crash and “2022-02-23 20:24:07.860 ( 6.946s) [] vtkOpenGLState.cxx:2024 WARN| Attempt to pop framebuffer beyond beginning of the stack.  
Generic Warning: In E:\CAD\VTK\_INSTALLATION\VTK-9.1.0\Rendering\OpenGL2\vtkOpenGLState.cxx, line 2024  
Attempt to pop framebuffer beyond beginning of the stack.” I want to know why crash, Thank you for your support.