# Error during modelling

**URL:** <https://prepomax.discourse.group/t/error-during-modelling/671>\
**Category:** Bug Reports\
**Created:** [January 12, 2023, 10:02am UTC](https://prepomax.discourse.group/t/error-during-modelling/671 "2023-01-12T10:02:58Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![Michal](https://avatars.discourse-cdn.com/v4/letter/m/34f0e0/32.png) [@Michal](https://prepomax.discourse.group/u/Michal)\
**Post date:** [January 12, 2023, 10:02am UTC](https://prepomax.discourse.group/t/error-during-modelling/671/1 "2023-01-12T10:02:58Z")

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I do not know what is wrong

 ![726](https://global.discourse-cdn.com/free1/uploads/prepomax/original/1X/fa46010bf9369a67c86db1be156b5558a933dbe3.jpeg)

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**Author:** ![Michal](https://avatars.discourse-cdn.com/v4/letter/m/34f0e0/32.png) [@Michal](https://prepomax.discourse.group/u/Michal)\
**Post date:** [January 12, 2023, 11:01am UTC](https://prepomax.discourse.group/t/error-during-modelling/671/2 "2023-01-12T11:01:48Z")

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when I had started to use shells then problem appeared

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**Author:** ![Matej](https://avatars.discourse-cdn.com/v4/letter/m/a698b9/32.png) [@Matej](https://prepomax.discourse.group/u/Matej)\
**Post date:** [January 12, 2023, 11:17am UTC](https://prepomax.discourse.group/t/error-during-modelling/671/3 "2023-01-12T11:17:02Z")

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This is usually related to a bug. It is hard to determine what is wrong. Maybe when something was deleted, some tracks remained. Or you opened the model with different versions of PrePoMax. If I could look into the .pmx file I could tell you more.

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**Author:** ![Michal](https://avatars.discourse-cdn.com/v4/letter/m/34f0e0/32.png) [@Michal](https://prepomax.discourse.group/u/Michal)\
**Post date:** [January 12, 2023, 11:32am UTC](https://prepomax.discourse.group/t/error-during-modelling/671/4 "2023-01-12T11:32:50Z")

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sory but I can not send model - company policy  
best regards

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**Author:** ![Michal](https://avatars.discourse-cdn.com/v4/letter/m/34f0e0/32.png) [@Michal](https://prepomax.discourse.group/u/Michal)\
**Post date:** [January 12, 2023, 2:58pm UTC](https://prepomax.discourse.group/t/error-during-modelling/671/5 "2023-01-12T14:58:54Z")

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I have used only version PPM 1\_3\_5\_1 for this model I have noticed when I’m staring using shells and add constraints then the bug appears for solids ppm works fine but then I have problem with memory error . Also in the past I had bug problems when using mixed solid shell model especially when creating constraints then begin bugs  
best regards