# problem in dragon demo

**URL:** https://discourse.paraview.org/t/problem-in-dragon-demo/10245
**Category:** ParaView Support
**Created:** [September 2, 2022, 6:24pm UTC](https://discourse.paraview.org/t/problem-in-dragon-demo/10245 "2022-09-02T18:24:58Z")
**Posts on this page:** 3
**Page:** 1

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### Author: ![Pravin\_Poudel](https://discourse.paraview.org/user_avatar/discourse.paraview.org/pravin_poudel/32/9830_2.png) [@Pravin\_Poudel](https://discourse.paraview.org/u/Pravin_Poudel)
#### Post date: [September 2, 2022, 6:24pm UTC](https://discourse.paraview.org/t/problem-in-dragon-demo/10245/1 "2022-09-02T18:24:58Z")

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I am learning to use paraview and ttk. I am stuck with dragon example itself.

I am watching youtube video on ttk official site and when i click persistence threshold i get this error

 ![image](https://discourse.paraview.org/uploads/default/original/2X/3/3b609ec5b00956b46414516f9b9c25044b7e1b74.png)

can anyone help me please

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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: [September 5, 2022, 3:18am UTC](https://discourse.paraview.org/t/problem-in-dragon-demo/10245/2 "2022-09-05T03:18:01Z")

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@Charles_Gueunet

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### Author: ![Charles\_Gueunet](https://discourse.paraview.org/user_avatar/discourse.paraview.org/charles_gueunet/32/40_2.png) [@Charles\_Gueunet](https://discourse.paraview.org/u/Charles_Gueunet)
#### Post date: [September 6, 2022, 7:20am UTC](https://discourse.paraview.org/t/problem-in-dragon-demo/10245/3 "2022-09-06T07:20:34Z")

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Hello @Pravin_Poudel ,  
Thanks for your interest in TTK, can you provide the version of ParaView you are using ?  
Also, do you use the provided TTK or a compiled one ?  
Finally, do you load the state from the TTK data repository ?

@julien-tierny may also help here 🙂