# Paraview 5.10.1 on Mac cannot open VTK files with more than ~10,000 cells.

**URL:** https://discourse.paraview.org/t/paraview-5-10-1-on-mac-cannot-open-vtk-files-with-more-than-10-000-cells/9542
**Category:** ParaView Support
**Created:** [April 29, 2022, 7:29pm UTC](https://discourse.paraview.org/t/paraview-5-10-1-on-mac-cannot-open-vtk-files-with-more-than-10-000-cells/9542 "2022-04-29T19:29:34Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![nxrq67](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/n/f08c70/32.png) [@nxrq67](https://discourse.paraview.org/u/nxrq67)
#### Post date: [April 29, 2022, 7:29pm UTC](https://discourse.paraview.org/t/paraview-5-10-1-on-mac-cannot-open-vtk-files-with-more-than-10-000-cells/9542/1 "2022-04-29T19:29:34Z")

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Hello,

I am using VTK 5.10.1 on Mac OS11 and am trying to read in a VTK Unstructured Grid file. VTK will successfully read files with fewer than ~10,000 cells. However, for larger numbers of cells, I receive the following error:

ERROR: In /opt/glr/paraview/paraview-ci/build/superbuild/paraview/src/VTK/IO/Legacy/vtkDataReader.cxx, line 3370  
vtkUnstructuredGridReader (0x7f86a65d78b0): Error reading ascii cell data! for file: ./grid.vtk

This error seems quite similar to a previous post from a user regarding Paraview 5.7:  
[Paraview 5.7.0 does not load more than 12000 cells-(ubuntu 20.04 python 3.8.2)](https://discourse.paraview.org/t/paraview-5-7-0-does-not-load-more-than-12000-cells-ubuntu-20-04-python-3-8-2/4465) – so it appears the problem has persisted into future versions and on Mac as well.

For my purposes I need far larger grids than 10,000 cells. How can this be addressed so that Paraview can read larger VTK files?

Regards,  
Nathan