# SlicerRT built from source cannot start

**URL:** <https://discourse.slicer.org/t/slicerrt-built-from-source-cannot-start/43792>\
**Category:** Support\
**Tags:** build\
**Created:** [July 21, 2025, 8:52am UTC](https://discourse.slicer.org/t/slicerrt-built-from-source-cannot-start/43792 "2025-07-21T08:52:11Z")\
**Posts on this page:** 1\
**Showing post:** 36

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**Author:** ![cpinter](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/cpinter/32/7995_2.png) [@cpinter](https://discourse.slicer.org/u/cpinter)\
**Post date:** [August 7, 2025, 9:28am UTC](https://discourse.slicer.org/t/slicerrt-built-from-source-cannot-start/43792/36 "2025-08-07T09:28:49Z")

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Interesting. Thanks for further looking into it. Could this be related to the Python upgrade? The same thing that causes [this problem](https://discourse.slicer.org/t/build-error-in-windows-in-debug-mode-due-to-python312-d-lib/43781/2). @lassoan @jcfr

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