# couldn't find material.cpp file

**URL:** <https://openmc.discourse.group/t/couldnt-find-material-cpp-file/642>\
**Category:** User Support\
**Created:** [July 14, 2020, 2:34am UTC](https://openmc.discourse.group/t/couldnt-find-material-cpp-file/642 "2020-07-14T02:34:33Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![abdel\_laouzi](https://yyz2.discourse-cdn.com/free1/user_avatar/openmc.discourse.group/abdel_laouzi/32/1021_2.png) [@abdel\_laouzi](https://openmc.discourse.group/u/abdel_laouzi)\
**Post date:** [July 14, 2020, 2:34am UTC](https://openmc.discourse.group/t/couldnt-find-material-cpp-file/642/1 "2020-07-14T02:34:33Z")

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i have tried to fixe the Error in S(alpha,beta) table during Burnup calculation of U-ZrH fuel (openmc version 0.12.0-dev)  
but i couldn’t find the material.cpp file ,i have an openmc-py3.7 installed in my lap, openmc-dev under miniconda.  
best regards

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**Author:** ![Pranto](https://yyz2.discourse-cdn.com/free1/user_avatar/openmc.discourse.group/pranto/32/489_2.png) [@Pranto](https://openmc.discourse.group/u/Pranto)\
**Post date:** [July 14, 2020, 5:58am UTC](https://openmc.discourse.group/t/couldnt-find-material-cpp-file/642/2 "2020-07-14T05:58:51Z")

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Hello Laouzi,

Paul has already fixed this error and submitted a PR. [Link](https://github.com/openmc-dev/openmc/pull/1605)

You will find material.cpp file under openmc/src folder.

-Pranto