# Programmable filter not recognising inputs\[0\]

**URL:** https://discourse.paraview.org/t/programmable-filter-not-recognising-inputs-0/1602
**Category:** ParaView Support
**Created:** [April 5, 2019, 1:27am UTC](https://discourse.paraview.org/t/programmable-filter-not-recognising-inputs-0/1602 "2019-04-05T01:27:59Z")
**Posts on this page:** 6
**Page:** 1

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### Author: ![hsheldon](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/h/8491ac/32.png) [@hsheldon](https://discourse.paraview.org/u/hsheldon)
#### Post date: [April 5, 2019, 1:27am UTC](https://discourse.paraview.org/t/programmable-filter-not-recognising-inputs-0/1602/1 "2019-04-05T01:27:59Z")

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I am having trouble creating a programmable filter, it appears that Paraview is not recognising inputs[0]. It gives an error message:  
‘NoneType’ object has no attribute ‘ **getItem** ’  
This happens even if my filter just says something trivial like a=inputs[0]  
I am using version 5.4.1.

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### Author: ![cory.quammen](https://discourse.paraview.org/user_avatar/discourse.paraview.org/cory.quammen/32/11193_2.png) [@cory.quammen](https://discourse.paraview.org/u/cory.quammen)
#### Post date: [April 5, 2019, 2:29am UTC](https://discourse.paraview.org/t/programmable-filter-not-recognising-inputs-0/1602/2 "2019-04-05T02:29:21Z")

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Heather, welcome to the ParaView community. That is a mysterious error. When you created the **Programmable Filter** , did you have an object selected in the pipeline browser? Another thought: are you sure you created a **Programmable Filter** and not a **Programmable Source** by chance?

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### Author: ![hsheldon](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/h/8491ac/32.png) [@hsheldon](https://discourse.paraview.org/u/hsheldon)
#### Post date: [April 5, 2019, 2:33am UTC](https://discourse.paraview.org/t/programmable-filter-not-recognising-inputs-0/1602/3 "2019-04-05T02:33:51Z")

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Yes, definitely have an object selected, and I’m definitely creating a Programmable Filter. Its very strange, I’ve not had this trouble previously.

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### 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: [April 5, 2019, 7:42am UTC](https://discourse.paraview.org/t/programmable-filter-not-recognising-inputs-0/1602/5 "2019-04-05T07:42:53Z")

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Please provide your programmable filter code if possible.

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### Author: ![hsheldon](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/h/8491ac/32.png) [@hsheldon](https://discourse.paraview.org/u/hsheldon)
#### Post date: [April 5, 2019, 10:04am UTC](https://discourse.paraview.org/t/programmable-filter-not-recognising-inputs-0/1602/6 "2019-04-05T10:04:29Z")

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[ProgrammableFilterIntFlux.py](https://discourse.paraview.org/uploads/default/original/2X/8/857a18c6f020aa9c6028aa10a80e2073497fd541.py) (584 Bytes)

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### Author: ![cory.quammen](https://discourse.paraview.org/user_avatar/discourse.paraview.org/cory.quammen/32/11193_2.png) [@cory.quammen](https://discourse.paraview.org/u/cory.quammen)
#### Post date: [April 11, 2019, 3:06pm UTC](https://discourse.paraview.org/t/programmable-filter-not-recognising-inputs-0/1602/7 "2019-04-11T15:06:00Z")

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Hmm, nothing jumps out at me. Do you have a small example dataset that should work with this filter that you can share?