# Loading PyFR .vtu files error using ParaView 5.13.3

**URL:** https://discourse.paraview.org/t/loading-pyfr-vtu-files-error-using-paraview-5-13-3/17325
**Category:** ParaView Support
**Created:** [November 22, 2025, 9:39pm UTC](https://discourse.paraview.org/t/loading-pyfr-vtu-files-error-using-paraview-5-13-3/17325 "2025-11-22T21:39:10Z")
**Posts on this page:** 4
**Page:** 1

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### Author: ![Amber\_Jia](https://discourse.paraview.org/user_avatar/discourse.paraview.org/amber_jia/32/17248_2.png) [@Amber\_Jia](https://discourse.paraview.org/u/Amber_Jia)
#### Post date: [November 22, 2025, 9:39pm UTC](https://discourse.paraview.org/t/loading-pyfr-vtu-files-error-using-paraview-5-13-3/17325/1 "2025-11-22T21:39:10Z")

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Dear ParaView Support,

I was trying to open a .vtu file generated by PyFR using ParaView 5.13.3. And i get this error:

```auto
ERROR: In vtkXMLUnstructuredDataReader.cxx, line 766
vtkXMLUnstructuredGridReader (00000272CF3EA3D0): Cannot read cell connectivity from Cells in piece 2 because the “offsets” array is not monotonically increasing or starts with a value other than 0.

ERROR: In vtkXMLUnstructuredDataReader.cxx, line 766
vtkXMLUnstructuredGridReader (00000272CE40D110): Cannot read cell connectivity from Cells in piece 2 because the “offsets” array is not monotonically increasing or starts with a value other than 0.

```

However, this is the same file which I used to be able to load using earlier version of ParaView in 2024.

Could please help me with the proper loading file steps? Or could you please check whether the file itself was damaged?

please find the file on the shared google drive, Thanks a lot and I look forward to your guidance!

> **[Google Drive: Sign-in](https://accounts.google.com/v3/signin/identifier?continue=https%3A%2F%2Fdrive.google.com%2Ffile%2Fd%2F1D6h7wRK6H_1WdzuiXstgbNTCbHzLQ_Q7%2Fview%3Fusp%3Ddrive_link&dsh=S-1274669812%3A1763975310382603&followup=https%3A%2F%2Fdrive.google.com%2Ffile%2Fd%2F1D6h7wRK6H_1WdzuiXstgbNTCbHzLQ_Q7%2Fview%3Fusp%3Ddrive_link&ifkv=ARESoU10jT940lLWubRzWbwdnNDzzdsr_3x0gPLXaIpua8sTwh7kuKoLnYZIcNSxtgu1AEQcHPlxgw&osid=1&passive=1209600&service=wise&flowName=GlifWebSignIn&flowEntry=ServiceLogin)**
>
> Access Google Drive with a Google account (for personal use) or Google Workspace account (for business use).

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<div class="post-metadata">

### Author: ![mwestphal](https://discourse.paraview.org/user_avatar/discourse.paraview.org/mwestphal/32/17_2.png) [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [November 24, 2025, 9:09am UTC](https://discourse.paraview.org/t/loading-pyfr-vtu-files-error-using-paraview-5-13-3/17325/2 "2025-11-24T09:09:03Z")

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Please share your data

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<div class="post-metadata">

### Author: ![Amber\_Jia](https://discourse.paraview.org/user_avatar/discourse.paraview.org/amber_jia/32/17248_2.png) [@Amber\_Jia](https://discourse.paraview.org/u/Amber_Jia)
#### Post date: [November 24, 2025, 9:24am UTC](https://discourse.paraview.org/t/loading-pyfr-vtu-files-error-using-paraview-5-13-3/17325/3 "2025-11-24T09:24:44Z")

</div>

I have approved your access request, please let me know if there’s issues viewing it. Thank you very much!

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<div class="post-metadata">

### Author: ![mwestphal](https://discourse.paraview.org/user_avatar/discourse.paraview.org/mwestphal/32/17_2.png) [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [November 24, 2025, 9:37am UTC](https://discourse.paraview.org/t/loading-pyfr-vtu-files-error-using-paraview-5-13-3/17325/4 "2025-11-24T09:37:10Z")

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I reproduce the issue but I think the error is genuine, you need to fix your data.

> I used to be able to load using earlier version of ParaView in 2024.

ParaView 5.9 (2021) is unable to read this data and fails with the same error, so I doubt that.