# Matrix not factorable

**URL:** <https://www.simscale.com/forum/t/matrix-not-factorable/81749>\
**Category:** Project Support\
**Created:** [February 25, 2018, 5:55pm UTC](https://www.simscale.com/forum/t/matrix-not-factorable/81749 "2018-02-25T17:55:14Z")\
**Posts on this page:** 1\
**Showing post:** 4

<div class="post-metadata">

**Author:** ![jousefm](https://www.simscale.com/forum/user_avatar/www.simscale.com/jousefm/32/34908_2.png) [@jousefm](https://www.simscale.com/forum/u/jousefm)\
**Post date:** [February 25, 2018, 7:58pm UTC](https://www.simscale.com/forum/t/matrix-not-factorable/81749/4 "2018-02-25T19:58:45Z")

</div>

Hi @gkotelnytskyy!

Please be aware that one face can not be a slave face of different contact definitions simultaneously. The same goes for slave faces of Contacts. On top of that make sure to start another iteration with a **[second order mesh](https://www.simscale.com/forum/t/when-should-i-use-a-second-order-mesh/25899)**. I have successfully been able to run a simulation with a bonded contact definition without any error.

P.S.: Shared the project with you. Name of the simulation: **with\_support**. Name of the run: **RUN NEW - FIRST ORDER**.

**Update** : Successfully finished the second order mesh simulation as well! Feel free to have a look at it and copy the project.

Best,

Jousef

---

_[View the full topic](https://www.simscale.com/forum/t/matrix-not-factorable/81749)._