# How to use mortar contact?

**URL:** <https://prepomax.discourse.group/t/how-to-use-mortar-contact/596>\
**Category:** General Questions\
**Created:** [December 5, 2022, 10:45pm UTC](https://prepomax.discourse.group/t/how-to-use-mortar-contact/596 "2022-12-05T22:45:27Z")\
**Posts on this page:** 1\
**Showing post:** 12

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**Author:** ![celikan](https://avatars.discourse-cdn.com/v4/letter/c/f05b48/32.png) [@celikan](https://prepomax.discourse.group/u/celikan)\
**Post date:** [December 7, 2022, 9:10am UTC](https://prepomax.discourse.group/t/how-to-use-mortar-contact/596/12 "2022-12-07T09:10:47Z")

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In one of [my simulation](https://prepomax.discourse.group/t/excessive-displacement/600), I tried to use mortar type of contact. I simply changed surface-to-surface to the mortar. The following errors appear:

 ![error1](https://global.discourse-cdn.com/free1/uploads/prepomax/original/1X/e1bc745475d7036bed8817a0ffa28334b6e3bf94.jpeg)

Is there some specific needs when using mortar?  
It seems that there is a problem with depended nodes in MPC …  
_I checked CalculiX documentation for awareness (e.g. to be used only with static analysis) but I did not find other specifics to follow._

Thanks in advance for any advice.

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