# particle tracer error: Number of components do not match

**URL:** https://discourse.paraview.org/t/particle-tracer-error-number-of-components-do-not-match/12455
**Category:** ParaView Support
**Created:** [July 5, 2023, 8:08pm UTC](https://discourse.paraview.org/t/particle-tracer-error-number-of-components-do-not-match/12455 "2023-07-05T20:08:17Z")
**Posts on this page:** 3
**Page:** 1

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### Author: ![Krentos\_Iliakopoulos](https://discourse.paraview.org/user_avatar/discourse.paraview.org/krentos_iliakopoulos/32/11934_2.png) [@Krentos\_Iliakopoulos](https://discourse.paraview.org/u/Krentos_Iliakopoulos)
#### Post date: [July 5, 2023, 8:08pm UTC](https://discourse.paraview.org/t/particle-tracer-error-number-of-components-do-not-match/12455/1 "2023-07-05T20:08:18Z")

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hello, i want to trace some particles injected to a domain where i know the velocity field data for every time step. I have already created a .pvd file containing the data in order to import it to paraview. Now when it comes to using the Particle tracer filter, i get the following error messages:

ERROR: In vtkGenericDataArray.txx, line 63

vtkTypeFloat64Array (000001F993D4B340): Number of components do not match: Source: 3 Dest: 1

ERROR: In vtkGenericDataArray.txx, line 63

vtkTypeFloat64Array (000001F9FD76B620): Number of components do not match: Source: 1 Dest: 3

ERROR: In vtkGenericDataArray.txx, line 63

vtkTypeFloat64Array (000001F9FD76BD50): Number of components do not match: Source: 1 Dest: 3

ERROR: In vtkGenericDataArray.txx, line 63

vtkTypeFloat64Array (000001F9FD76B060): Number of components do not match: Source: 1 Dest: 4

and so on…

 ![image](https://discourse.paraview.org/uploads/default/original/2X/a/ad01266f587a278bb4fc66972f8ea85f18696140.png)

Do you have any idea regarding to those errors? Besides the errors, the animation of the filter seems to work. I insert the calculated velocity field as an input to the filter and a line as a seed source. Here is also the .pvd file that i am using.  
[all\_results.pvd](https://discourse.paraview.org/uploads/short-url/gCvv1uNFORKf8movy4QMpF9Xoe5.pvd) (20.0 KB)  
Any idea would be much appreciated!

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### Author: ![Andy\_Bauer](https://discourse.paraview.org/user_avatar/discourse.paraview.org/andy_bauer/32/5442_2.png) [@Andy\_Bauer](https://discourse.paraview.org/u/Andy_Bauer)
#### Post date: [July 6, 2023, 12:06pm UTC](https://discourse.paraview.org/t/particle-tracer-error-number-of-components-do-not-match/12455/2 "2023-07-06T12:06:22Z")

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Generally this happens with the particle tracer filter when there is a different number of arrays or the arrays that are available are ordered differently in the input dataset to the filter. A .pvd file is only a meta-file so I can’t see your actual data.

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### Author: ![Krentos\_Iliakopoulos](https://discourse.paraview.org/user_avatar/discourse.paraview.org/krentos_iliakopoulos/32/11934_2.png) [@Krentos\_Iliakopoulos](https://discourse.paraview.org/u/Krentos_Iliakopoulos)
#### Post date: [July 6, 2023, 6:35pm UTC](https://discourse.paraview.org/t/particle-tracer-error-number-of-components-do-not-match/12455/3 "2023-07-06T18:35:20Z")

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thank you for your answer Andy! Here you can find my actual data: [vtu files for PT - Google Drive](https://drive.google.com/drive/folders/1UW-oPEucYNzp82mqiu41BoBFwXBaRC63?usp=sharing)