# Errors during compound part operation

**URL:** https://prepomax.discourse.group/t/errors-during-compound-part-operation/2887
**Category:** Bug Reports
**Created:** [July 26, 2025, 10:53am UTC](https://prepomax.discourse.group/t/errors-during-compound-part-operation/2887 "2025-07-26T10:53:41Z")
**Posts on this page:** 4
**Page:** 1

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### Author: ![lukerickert](https://avatars.discourse-cdn.com/v4/letter/l/53a042/32.png) [@lukerickert](https://prepomax.discourse.group/u/lukerickert)
#### Post date: [July 26, 2025, 10:53am UTC](https://prepomax.discourse.group/t/errors-during-compound-part-operation/2887/1 "2025-07-26T10:53:41Z")

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I am getting some errors making compound surface parts. It seems fairly random from what I can tell.

 ![compound_part_error](https://global.discourse-cdn.com/free1/uploads/prepomax/original/2X/4/4a5c5b67c6d32c6b09e12bfbd2e4ba312a5bf293.png)

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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: [September 23, 2025, 8:22am UTC](https://prepomax.discourse.group/t/errors-during-compound-part-operation/2887/2 "2025-09-23T08:22:18Z")

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The error you get is connected to the file name (as it seems). Are you using a very long absolute path to the PrePoMax folder? Try moving the PrePoMax folder to a shorter path, like c:\PrePoMax

But it could also be a consequence of the compounding process, which takes place using the Netgen library that uses OpenCascade. There, I have limited possibilities of improving it.

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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: [October 9, 2025, 1:18pm UTC](https://prepomax.discourse.group/t/errors-during-compound-part-operation/2887/3 "2025-10-09T13:18:37Z")

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Can you preapre an example?

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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 18, 2026, 5:31pm UTC](https://prepomax.discourse.group/t/errors-during-compound-part-operation/2887/4 "2026-01-18T17:31:55Z")

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