# Modules failed to be instantiated

**URL:** <https://discourse.slicer.org/t/modules-failed-to-be-instantiated/24912>\
**Category:** Development\
**Created:** [August 25, 2022, 2:45am UTC](https://discourse.slicer.org/t/modules-failed-to-be-instantiated/24912 "2022-08-25T02:45:37Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![miniminic](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/miniminic/32/16647_2.png) [@miniminic](https://discourse.slicer.org/u/miniminic)\
**Post date:** [August 25, 2022, 2:45am UTC](https://discourse.slicer.org/t/modules-failed-to-be-instantiated/24912/1 "2022-08-25T02:45:38Z")

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This is fine under debug, but has a lot of errors under Release

 ![捕获](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/d/4/d4dc39c0d25d6083e0cc71a2caaffe80bbe4823d.png)  
 ![捕获2](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/8/c/8c8042b6a55bda5d4dfbaeea311545a981b8dea9.png)

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**Author:** ![miniminic](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/miniminic/32/16647_2.png) [@miniminic](https://discourse.slicer.org/u/miniminic)\
**Post date:** [August 25, 2022, 6:35am UTC](https://discourse.slicer.org/t/modules-failed-to-be-instantiated/24912/2 "2022-08-25T06:35:20Z")

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I rebuilt the Slicer in a different folder to temporarily fix the problem,but I don’t know if it will happen again

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**Author:** ![jamesobutler](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/jamesobutler/32/7511_2.png) [@jamesobutler](https://discourse.slicer.org/u/jamesobutler)\
**Post date:** [August 25, 2022, 1:00pm UTC](https://discourse.slicer.org/t/modules-failed-to-be-instantiated/24912/3 "2022-08-25T13:00:05Z")

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Make sure you don’t build debug and release into the same build tree. You will need separate build trees such as at C:/S5D and C:/S5R.

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**Author:** ![miniminic](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/miniminic/32/16647_2.png) [@miniminic](https://discourse.slicer.org/u/miniminic)\
**Post date:** [August 28, 2022, 3:10am UTC](https://discourse.slicer.org/t/modules-failed-to-be-instantiated/24912/4 "2022-08-28T03:10:09Z")

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Thank for your answer.