# WarnNodeMissTiedContact

**URL:** <https://calculix.discourse.group/t/warnnodemisstiedcontact/1591>\
**Category:** Uncategorized\
**Created:** [April 15, 2023, 4:49am UTC](https://calculix.discourse.group/t/warnnodemisstiedcontact/1591 "2023-04-15T04:49:12Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Awareness](https://avatars.discourse-cdn.com/v4/letter/a/82dd89/32.png) [@Awareness](https://calculix.discourse.group/u/Awareness)\
**Post date:** [April 15, 2023, 4:49am UTC](https://calculix.discourse.group/t/warnnodemisstiedcontact/1591/1 "2023-04-15T04:49:12Z")

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What do I miss?

\*HEADING  
Contact  
\*include, input=all.msh  
\*SURFACE,NAME=BIGSURF1  
18, S1  
19, S1  
\*SURFACE,NAME=SMALLSURF2  
69, S3  
73, S3  
85, S3  
89, S3  
\*TIE,NAME=TIE1  
SMALLSURF2,BIGSURF1  
\*BOUNDARY  
\*include, input=fix\_123456.bou  
\*MATERIAL,NAME=EL  
\*ELASTIC  
2e6,0.3  
\*SOLID SECTION,ELSET=Eall,MATERIAL=EL  
\*STEP  
\*STATIC  
\*DLOAD  
\*INCLUDE,INPUT=load.dlo  
\*NODE PRINT  
U  
\*NODE FILE  
U  
\*EL FILE  
S  
\*END STEP

This way

\*HEADING  
Contact  
\*include, input=all.msh  
\*include, input=b-contact.nam  
\*include, input=s-contact.nam  
\*SURFACE,NAME=BIGSURF1  
18, S1  
19, S1  
\*SURFACE,NAME=SMALLSURF2,TYPE=NODE  
Ns-contact  
\*TIE,NAME=TIE1  
SMALLSURF2,BIGSURF1  
\*BOUNDARY  
\*include, input=fix\_123456.bou  
\*MATERIAL,NAME=EL  
\*ELASTIC  
2e6,0.3  
\*SOLID SECTION,ELSET=Eall,MATERIAL=EL  
\*STEP  
\*STATIC  
\*DLOAD  
\*INCLUDE,INPUT=load.dlo  
\*NODE FILE  
U  
\*EL FILE  
S  
\*END STEP

…  
\*INFO in gentiedmpc:  
failed nodes (if any) are stored in file  
WarnNodeMissTiedContact.nam  
This file can be loaded into  
an active cgx-session by typing  
read WarnNodeMissTiedContact.nam inp

And the other thing if write the following  
\*SURFACE,NAME=BIGSURF1, TYPE=NODE  
Nb-contact

\*ERROR in allocont: master surface BIGSURF1  
does not exist or does not contain  
element faces

Why is that so? CalculiX examples by Prof. Martin Kraska add confusion to the matter than a clarity to it. May be there are special rules to read the examples I am not aware of?