# \[openmc-users\] Error in running OpenMC version 0.9

**URL:** <https://openmc.discourse.group/t/openmc-users-error-in-running-openmc-version-0-9/305>\
**Category:** User Support\
**Created:** [January 12, 2018, 3:52pm UTC](https://openmc.discourse.group/t/openmc-users-error-in-running-openmc-version-0-9/305 "2018-01-12T15:52:11Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![paulromano](https://yyz2.discourse-cdn.com/free1/user_avatar/openmc.discourse.group/paulromano/32/486_2.png) [@paulromano](https://openmc.discourse.group/u/paulromano)\
**Post date:** [January 12, 2018, 3:52pm UTC](https://openmc.discourse.group/t/openmc-users-error-in-running-openmc-version-0-9/305/1 "2018-01-12T15:52:11Z")

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Hi Afaf,

Would you be willing to share you input files for me to take a look at in order to diagnose the problem you’re having? I suspect there may be something wrong with your model, but the error message you’re getting is not very helpful.

Best regards,  
Paul

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**Author:** ![paulromano](https://yyz2.discourse-cdn.com/free1/user_avatar/openmc.discourse.group/paulromano/32/486_2.png) [@paulromano](https://openmc.discourse.group/u/paulromano)\
**Post date:** [January 15, 2018, 5:53pm UTC](https://openmc.discourse.group/t/openmc-users-error-in-running-openmc-version-0-9/305/2 "2018-01-15T17:53:49Z")

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For the record, this error was caused by a specified material not existing in materials.xml. While version 0.9.0 gives a cryptic error message, version 0.10.0 gives the following informative message:

ERROR: Could not find material 9 specified on cell 9