# Error: Could not find nuclide U-235.70c in cross\_sections.xml file **URL:** \ **Category:** User Support\ **Created:** [June 14, 2014, 7:52am UTC](https://openmc.discourse.group/t/error-could-not-find-nuclide-u-235-70c-in-cross-sections-xml-file/81 "2014-06-14T07:52:02Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![Xinyan\_Wang](https://avatars.discourse-cdn.com/v4/letter/x/48db29/32.png) [@Xinyan\_Wang](https://openmc.discourse.group/u/Xinyan_Wang)\ **Post date:** [June 14, 2014, 7:52am UTC](https://openmc.discourse.group/t/error-could-not-find-nuclide-u-235-70c-in-cross-sections-xml-file/81/1 "2014-06-14T07:52:02Z")
Hello, I just run the tests provided in openMC. Now I find this problem as shown in the figure(“Error: Could not find nuclide U-235.70c in cross\_sections.xml file”). Is there anything wrong with the cross\_section data? I use NNDC data. Should I reinstall NNDC? Thanks! ---
**Author:** ![Adam\_Nelson](https://avatars.discourse-cdn.com/v4/letter/a/8edcca/32.png) [@Adam\_Nelson](https://openmc.discourse.group/u/Adam_Nelson)\ **Post date:** [June 14, 2014, 11:11am UTC](https://openmc.discourse.group/t/error-could-not-find-nuclide-u-235-70c-in-cross-sections-xml-file/81/2 "2014-06-14T11:11:22Z")
Hi Xinyan, The NNDC data does not provide U-235.70c; instead its numbering for temperature starts at .71c. It seems as if the test you are running is from a slightly older version of our code as on April 14 we merged in changes so that the tests used the NNDC data. So either update or change all instances of .70c to .71c and you will have fixed the problem. Sorry about that! Adam ---
**Author:** ![Xinyan\_Wang](https://avatars.discourse-cdn.com/v4/letter/x/48db29/32.png) [@Xinyan\_Wang](https://openmc.discourse.group/u/Xinyan_Wang)\ **Post date:** [June 15, 2014, 7:21am UTC](https://openmc.discourse.group/t/error-could-not-find-nuclide-u-235-70c-in-cross-sections-xml-file/81/3 "2014-06-15T07:21:12Z")
Thanks! I will do that right away