# DAGMC Universe Issue **URL:** \ **Category:** User Support\ **Created:** [June 25, 2024, 12:25pm UTC](https://openmc.discourse.group/t/dagmc-universe-issue/4458 "2024-06-25T12:25:24Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![gglamzn](https://avatars.discourse-cdn.com/v4/letter/g/e19adc/32.png) [@gglamzn](https://openmc.discourse.group/u/gglamzn)\ **Post date:** [June 25, 2024, 12:25pm UTC](https://openmc.discourse.group/t/dagmc-universe-issue/4458/1 "2024-06-25T12:25:24Z")
Hello, I wanted to perform a simulation on a CAD geometry to compare the results with the geometries defined in OpenMC. Therefore, I reproduced an identical geometry, by coding it in OpenMC on one hand and on the other hand using a CAD software. Here are some images of my geometry, which is simple ![geonetry_interior](https://global.discourse-cdn.com/free1/uploads/openmc/original/2X/8/83afe0a7ba1fd118ef7d67600a78261b43b58425.png) ![geometry_all](https://global.discourse-cdn.com/free1/uploads/openmc/original/2X/b/bbbe0a3594f7a66e8e636e3166e5618fccf7f7ce.png) The geometry has dimensions of 14 m by 14 m in length and width, with a height of 3.5 m. It is centered at the point (0,0,0). I have attached to this request my Python code aiming to perform the simulation. I get this kind of error message when I run the code, and I can’t fix the errors: ![problem_simulation](https://global.discourse-cdn.com/free1/uploads/openmc/original/2X/2/2a8b0e1e26279765a3988fe17d04882792bbfbd6.png) [code\_simulation.py](https://openmc.discourse.group/uploads/short-url/7WAKkru3samOAjR4oicLjN2lwZJ.py) (7.6 KB) Could you help me as I’m having a hard time troubleshooting it? Thank you in advance. ---
**Author:** ![gglamzn](https://avatars.discourse-cdn.com/v4/letter/g/e19adc/32.png) [@gglamzn](https://openmc.discourse.group/u/gglamzn)\ **Post date:** [June 25, 2024, 12:28pm UTC](https://openmc.discourse.group/t/dagmc-universe-issue/4458/2 "2024-06-25T12:28:39Z")
It seems that I can’t fransfer the H5M geometry file