# Error overlapping cells

**URL:** <https://openmc.discourse.group/t/error-overlapping-cells/3146>\
**Category:** User Support\
**Created:** [June 26, 2023, 1:56am UTC](https://openmc.discourse.group/t/error-overlapping-cells/3146 "2023-06-26T01:56:53Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![Darilhana1](https://avatars.discourse-cdn.com/v4/letter/d/c2a13f/32.png) [@Darilhana1](https://openmc.discourse.group/u/Darilhana1)\
**Post date:** [June 26, 2023, 1:56am UTC](https://openmc.discourse.group/t/error-overlapping-cells/3146/1 "2023-06-26T01:56:53Z")

</div>

hello everyone, I’m running the carbide program to find the keff value to be 1. but there are overlapping cells. how to handle it?

 ![Cuplikan layar dari 2023-06-26 08-56-10](https://global.discourse-cdn.com/free1/uploads/openmc/original/2X/5/581b904a20889ba839645f820ae2560323c71d37.png)

---

<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 26, 2023, 1:13pm UTC](https://openmc.discourse.group/t/error-overlapping-cells/3146/2 "2023-06-26T13:13:20Z")

</div>

Please see recommendations on geometry debugging (including dealing with overlaps) here:  
[https://docs.openmc.org/en/latest/usersguide/troubleshoot.html#geometry-debugging](https://docs.openmc.org/en/latest/usersguide/troubleshoot.html#geometry-debugging)