# Extensions are not working when building Slicer from scratch

**URL:** <https://discourse.slicer.org/t/extensions-are-not-working-when-building-slicer-from-scratch/8412>\
**Category:** Development\
**Created:** [September 13, 2019, 12:41pm UTC](https://discourse.slicer.org/t/extensions-are-not-working-when-building-slicer-from-scratch/8412 "2019-09-13T12:41:47Z")\
**Posts on this page:** 1\
**Showing post:** 2

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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:** [September 13, 2019, 1:03pm UTC](https://discourse.slicer.org/t/extensions-are-not-working-when-building-slicer-from-scratch/8412/2 "2019-09-13T13:03:39Z")

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> [@fpsiddiqui91](#):
>
> download the extension packages

You cannot use factory-built extensions with your locally built Slicer. In that case you’ll need to clone and build the extensions you want to use.

See also for example

> [@Loadable module crashing binary Slicer](https://discourse.slicer.org/t/loadable-module-crashing-binary-slicer/1900):
>
> I have an error with my loadable module. I’ve built the Slicer stable version (revision 26489) and I’ve built my module against it without errors. The module works as intended when I launch the built Slicer version. However, if I try to launch module with the binary Slicer release (downloaded from the website, the 4.8.0 version - same as the built revision) the Slicer crashes before opening and I get the following error: “terminate called after throwing an instance of ‘H5::DataSpaceIException’” …

or

> [@Compiled App whichs source pulled from git cannot download extension due to reversion not match.](https://discourse.slicer.org/t/compiled-app-whichs-source-pulled-from-git-cannot-download-extension-due-to-reversion-not-match/6750):
>
> Problem report for Slicer 4.11.0-2019-05-01 win-amd64: [please describe expected and actual behavior] I compiled the Slicer reversion of “28202” which was pulled from github, and it’s reversion became “aae6a8c”, so that I can’t download extension from Extensions Manager online. The message from Extensions Manager says as below: “No extensions found for win:64-bit, revision: ‘aae6a8c’. Please try a different combination” After that I installed a SlicerVR extension, and it works well. Then I m…

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