# Probably a bug - shell to solid rigid body constraints + contact fails

**URL:** <https://prepomax.discourse.group/t/probably-a-bug-shell-to-solid-rigid-body-constraints-contact-fails/1434>\
**Category:** Bug Reports\
**Created:** [January 19, 2024, 1:32pm UTC](https://prepomax.discourse.group/t/probably-a-bug-shell-to-solid-rigid-body-constraints-contact-fails/1434 "2024-01-19T13:32:40Z")\
**Posts on this page:** 1\
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**Author:** ![FEAnalyst](https://yyz2.discourse-cdn.com/free1/user_avatar/prepomax.discourse.group/feanalyst/32/688_2.png) [@FEAnalyst](https://prepomax.discourse.group/u/FEAnalyst)\
**Post date:** [January 19, 2024, 2:27pm UTC](https://prepomax.discourse.group/t/probably-a-bug-shell-to-solid-rigid-body-constraints-contact-fails/1434/4 "2024-01-19T14:27:57Z")

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It seems to be a weird CalculiX bug or actually a regression. Try running the exported .inp file in different standalone versions of CalculiX (and with different solvers) to see when it stopped working. You can download old releases of ccx by just changing the number in this link: [http://www.dhondt.de/calculix\_2.21\_4win.zip](http://www.dhondt.de/calculix_2.21_4win.zip)

Instructions how to run jobs with standalone ccx: [Using standalone CalculiX](https://prepomax.discourse.group/t/using-standalone-calculix/846)

Then it would be best to create an issue in ccx GitHub repository: [Issues · Dhondtguido/CalculiX · GitHub](https://github.com/Dhondtguido/CalculiX/issues)

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