# Error in geometry file

**URL:** https://openmc.discourse.group/t/error-in-geometry-file/612
**Category:** User Support
**Created:** [June 8, 2020, 1:18pm UTC](https://openmc.discourse.group/t/error-in-geometry-file/612 "2020-06-08T13:18:37Z")
**Posts on this page:** 2
**Page:** 1

<div class="post-metadata">

### Author: ![gridley](https://yyz2.discourse-cdn.com/free1/user_avatar/openmc.discourse.group/gridley/32/1064_2.png) [@gridley](https://openmc.discourse.group/u/gridley)
#### Post date: [June 8, 2020, 1:18pm UTC](https://openmc.discourse.group/t/error-in-geometry-file/612/1 "2020-06-08T13:18:37Z")

</div>

Hey Bikash,

This is because you’ve not used the objects “front” and “back” as defined in your script to define the boundary of any cell. If you include those in your definitions of the problem’s boundaries, they should be included in the XML output. Good luck debugging your geometry!

Gavin

---

<div class="post-metadata">

### 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: [June 9, 2020, 3:00pm UTC](https://openmc.discourse.group/t/error-in-geometry-file/612/2 "2020-06-09T15:00:16Z")

</div>

Bikash- you may want to look at our guide for geometry debugging here:  
[https://docs.openmc.org/en/stable/usersguide/troubleshoot.html#geometry-debugging](https://docs.openmc.org/en/stable/usersguide/troubleshoot.html#geometry-debugging)