# where is vtkMultiBlockPLOT3DReader.cxx
**URL:** https://discourse.paraview.org/t/where-is-vtkmultiblockplot3dreader-cxx/11444
**Category:** Development
**Tags:** vtk
**Created:** [February 19, 2023, 5:54pm UTC](https://discourse.paraview.org/t/where-is-vtkmultiblockplot3dreader-cxx/11444 "2023-02-19T17:54:44Z")
**Posts on this page:** 6
**Page:** 1
### Author:  [@uporersith](https://discourse.paraview.org/u/uporersith)
#### Post date: [February 19, 2023, 5:54pm UTC](https://discourse.paraview.org/t/where-is-vtkmultiblockplot3dreader-cxx/11444/1 "2023-02-19T17:54:44Z")
I want to write my own reader plugin and model it off the PLOT3DReader plugin. Where can I find the file “vtkMultiBLockPLOT3DReader.cxx” file? I know it exists because Paraview will tell me there is an error there (see below). I tried searching my computer and searching the repository with no success.
ERROR: In vtkMultiBlockPLOT3DReader.cxx, line 3168
vtkMultiBlockPLOT3DReader (000001529CCE8690): Geometry and data dimensions do not match. Data file may be corrupt.
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### Author:  [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [February 20, 2023, 8:06am UTC](https://discourse.paraview.org/t/where-is-vtkmultiblockplot3dreader-cxx/11444/2 "2023-02-20T08:06:21Z")
Hi @uporersith ,
You seem to find the reader according to the error, you just do not configure it correctly.
Best,
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### Author:  [@uporersith](https://discourse.paraview.org/u/uporersith)
#### Post date: [February 20, 2023, 2:12pm UTC](https://discourse.paraview.org/t/where-is-vtkmultiblockplot3dreader-cxx/11444/3 "2023-02-20T14:12:57Z")
I’m sorry I need a little more help, can you provide a link to the file in the repository? I still cannot locate the file. I have downloaded the master source and searched with grep and still cannot locate the file.
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### Author:  [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [February 20, 2023, 2:14pm UTC](https://discourse.paraview.org/t/where-is-vtkmultiblockplot3dreader-cxx/11444/4 "2023-02-20T14:14:15Z")
> [@uporersith](#):
>
> vtkMultiBlockPLOT3DReader
`VTK/IO/Parallel/vtkMultiBlockPLOT3DReader.cxx`
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### Author:  [@uporersith](https://discourse.paraview.org/u/uporersith)
#### Post date: [February 20, 2023, 3:01pm UTC](https://discourse.paraview.org/t/where-is-vtkmultiblockplot3dreader-cxx/11444/5 "2023-02-20T15:01:40Z")
Thank you,
After finding the VTK folder empty, it occurred to me that I probably have to build paraview to get the file. I was able to do so and can find the file now.
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### Author:  [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [February 20, 2023, 3:03pm UTC](https://discourse.paraview.org/t/where-is-vtkmultiblockplot3dreader-cxx/11444/6 "2023-02-20T15:03:14Z")
you need to update your submodules
`git submodule update --init --recursive`