# Couldn't invoke the multipole library calculation function.

**URL:** <https://openmc.discourse.group/t/couldnt-invoke-the-multipole-library-calculation-function/530>\
**Category:** User Support\
**Created:** [December 26, 2019, 4:46am UTC](https://openmc.discourse.group/t/couldnt-invoke-the-multipole-library-calculation-function/530 "2019-12-26T04:46:25Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Guangchun\_Zhang](https://avatars.discourse-cdn.com/v4/letter/g/90ced4/32.png) [@Guangchun\_Zhang](https://openmc.discourse.group/u/Guangchun_Zhang)\
**Post date:** [December 26, 2019, 4:46am UTC](https://openmc.discourse.group/t/couldnt-invoke-the-multipole-library-calculation-function/530/1 "2019-12-26T04:46:25Z")

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Hi folks,

I am trying to couple OpenMC with a in-house CFD code, and hence need to use the windowed multipole library to consider the temperature feedback effects. I am using the OpenMC-v0.10.0 on a RHEL-7.7 cluster. The windowed multipole lib was downloaded from the official websit: [Official Data Libraries | OpenMC](https://openmc.org/official-data-libraries/). However, OpenMC gave the following error message:

> The OpenMC Monte Carlo Code  
> Copyright | 2011-2018 Massachusetts Institute of Technology  
> License | [License Agreement — OpenMC Documentation](http://openmc.readthedocs.io/en/latest/license.html)  
> Version | 0.10.0  
> Git SHA1 | 455efffdbf6eacbc0b3b93ad61cfeb24490897d8  
> Date/Time | 2019-12-25 23:40:44  
> OpenMP Threads | 32

Reading settings XML file…  
WARNING: Setting multipole\_library in settings.xml has been deprecated. The  
multipole\_library is now set in materials.xml and the  
multipole\_library input to materials.xml and the  
OPENMC\_MULTIPOLE\_LIBRARY environment variable will take precendent  
over setting multipole\_library in settings.xml.  
Reading cross sections XML file…  
Reading materials XML file…  
ERROR: Cross-section table U235 is not a continuous-energy neutron table.  
ERROR STOP

So it seems I did not correctly invoke the multipole library calculation function. Any idea what I am missing?

Thank you so much,  
Guangchun

[build-xml.py](https://openmc.discourse.group/uploads/short-url/y8tN94rPCOlrT5HaUjWMOJv58EE.py) (5.99 KB)

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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 5, 2020, 6:52pm UTC](https://openmc.discourse.group/t/couldnt-invoke-the-multipole-library-calculation-function/530/2 "2020-01-05T18:52:21Z")

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Hi Guangchun,

The data libraries that are distributed on [openmc.org](http://openmc.org) work with version 0.11 so if you’d like to use those, you’ll need to upgrade to version 0.11.

Best regards,  
Paul

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**Author:** ![Guangchun\_Zhang](https://avatars.discourse-cdn.com/v4/letter/g/90ced4/32.png) [@Guangchun\_Zhang](https://openmc.discourse.group/u/Guangchun_Zhang)\
**Post date:** [January 13, 2020, 7:49am UTC](https://openmc.discourse.group/t/couldnt-invoke-the-multipole-library-calculation-function/530/3 "2020-01-13T07:49:46Z")

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Thank you, Paul. I will try it and let you know the outcome.