# Unable to load CGNS file

**URL:** https://discourse.paraview.org/t/unable-to-load-cgns-file/2026
**Category:** ParaView Support
**Created:** [June 12, 2019, 4:20pm UTC](https://discourse.paraview.org/t/unable-to-load-cgns-file/2026 "2019-06-12T16:20:04Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![amtri](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/a/6bbea6/32.png) [@amtri](https://discourse.paraview.org/u/amtri)
#### Post date: [June 12, 2019, 4:20pm UTC](https://discourse.paraview.org/t/unable-to-load-cgns-file/2026/1 "2019-06-12T16:20:04Z")

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Hello,

I have a CGNS file built with CGNS 3.3.1 and with HDF5 version 1.10.5. The file consists of polyhedra with polygonal boundaries - i.e., NFACE\_n and NGON\_n.

Paraview is unable to read the file. If I convert it to ADF the file is read, but only the boundaries are detected. The interior faces are not listed.

The file consists of a single CGNS Zone with multiple CGNS Sections - one each for the boundaries, one for the remaining interior faces, and one for the polyhedra.

Are there known issues with Paraview regarding files of this nature? I am using the pre-built Windows version of Paraview 5.6.1.

Thanks.

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### Author: ![MicK7](https://discourse.paraview.org/user_avatar/discourse.paraview.org/mick7/32/1374_2.png) [@MicK7](https://discourse.paraview.org/u/MicK7)
#### Post date: [August 5, 2019, 7:48pm UTC](https://discourse.paraview.org/t/unable-to-load-cgns-file/2026/2 "2019-08-05T19:48:02Z")

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The use of HDF5 version 1.10.5 is not a recommanded practice for CGNS version earlier than 3.4.0.  
It would be better to test with a 1.8.x version of HDF5 with CGNS 3.3.1

ParaView is able to read NFACE\_n and NGON\_n.  
One can verify this with the test example of ParaView.