# Could not find nuclide U235 **URL:** \ **Category:** User Support\ **Created:** [October 30, 2022, 12:36pm UTC](https://openmc.discourse.group/t/could-not-find-nuclide-u235/2410 "2022-10-30T12:36:18Z")\ **Posts on this page:** 1\ **Showing post:** 6
**Author:** ![Dalia](https://avatars.discourse-cdn.com/v4/letter/d/a698b9/32.png) [@Dalia](https://openmc.discourse.group/u/Dalia)\ **Post date:** [October 31, 2022, 9:52am UTC](https://openmc.discourse.group/t/could-not-find-nuclide-u235/2410/6 "2022-10-31T09:52:02Z")
@oyardas2 Thank you so much for your help! I tried downloading the HDF5 library but I had a hard time making the jupyter notebook read the xml file, even though I would specify the directory correctly, I kept having these error on here: [Error no cross section.xml file was specified](https://openmc.discourse.group/t/error-no-cross-section-xml-file-was-specified/2397) @Shimwell Thank you so much for your help! here’s a screenshot of the nuclides that I get and, in here the error that I get is that it can’t find U238, I was also wondering if I needed nuclides that are downloaded separetly with different lines and they creat two different cross\_sections.xml files, when I need both should I call both in the terminal? I tried doing this but I guess it only read my last call. ![image](https://global.discourse-cdn.com/free1/uploads/openmc/original/2X/b/b7d418d4ec7e5c95da5de23dcb5bc9af26c1433a.png) --- _[View the full topic](https://openmc.discourse.group/t/could-not-find-nuclide-u235/2410)._