# API RDm engine solver error

**URL:** <https://forum.dynamobim.com/t/api-rdm-engine-solver-error/53826>\
**Category:** Robot Structural Analysis\
**Tags:** python\
**Created:** [August 7, 2020, 8:37am UTC](https://forum.dynamobim.com/t/api-rdm-engine-solver-error/53826 "2020-08-07T08:37:18Z")\
**Posts on this page:** 1\
**Showing post:** 11

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**Author:** ![1234eddie](https://avatars.discourse-cdn.com/v4/letter/1/4da419/32.png) [@1234eddie](https://forum.dynamobim.com/u/1234eddie)\
**Post date:** [October 6, 2022, 7:28am UTC](https://forum.dynamobim.com/t/api-rdm-engine-solver-error/53826/11 "2022-10-06T07:28:45Z")

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@Hadi.Moosavi

Check these links.

> **[Calculation of Steel Design, CPython3](https://forums.autodesk.com/t5/robot-structural-analysis-forum/calculation-of-steel-design-cpython3/m-p/11396933#M92738)**
>
> Hi all,  We are currently upgrading our scripts from IronPhyton 2 to CPhyton 3. I am trying to get the calculations of steel in Robot with Dynamo, CPython3 version. I want to achieve a result like the figure shows.  But I get the following...

> [@Calculation of Steel Design, CPython3](https://forum.dynamobim.com/t/calculation-of-steel-design-cpython3/80447/8):
>
> Hi Stefany, the error occurs because you didn’t imported BindingFlags from System.Reflection as illustrated in my example. I don’t know why, but you copied everything except the import part wink In my version I also got rid of the useless ProtoGeometry import and switched to the Interop.RobotOM.dll that you can find in RSA installation directory, instead of fiddling with users directories.

if you have more questions, start a new topic. if it’s full script related, dynamo forum works, but related to robot it’s better to use RSA forum.

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