# Error message

**URL:** https://discourse.paraview.org/t/error-message/9019
**Category:** ParaView Support
**Created:** [February 20, 2022, 9:56am UTC](https://discourse.paraview.org/t/error-message/9019 "2022-02-20T09:56:32Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![Lorenzo\_Marta](https://discourse.paraview.org/user_avatar/discourse.paraview.org/lorenzo_marta/32/8596_2.png) [@Lorenzo\_Marta](https://discourse.paraview.org/u/Lorenzo_Marta)
#### Post date: [February 20, 2022, 9:56am UTC](https://discourse.paraview.org/t/error-message/9019/1 "2022-02-20T09:56:32Z")

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I am trying to open mhd files obtained from 3DSlicer on Paraviw which always gives me this output message:

```auto
warning: In unknown, line 0
warning: Populating font family aliases took 211 ms. Replace uses of missing font family "Courier" with one that exists to avoid this cost. 

```

and in layout I cannot see some mhd file that I could see some time ago.  
What is the problem?

---

<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: [February 23, 2022, 10:46am UTC](https://discourse.paraview.org/t/error-message/9019/2 "2022-02-23T10:46:11Z")

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please share your data