# RapidWeaver Version 8

**URL:** <https://forums.realmacsoftware.com/t/rapidweaver-version-8/45279>\
**Category:** RapidWeaver Classic\
**Created:** [November 14, 2024, 11:09pm UTC](https://forums.realmacsoftware.com/t/rapidweaver-version-8/45279 "2024-11-14T23:09:19Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![DeLong](https://avatars.discourse-cdn.com/v4/letter/d/3d9bf3/32.png) [@DeLong](https://forums.realmacsoftware.com/u/DeLong)\
**Post date:** [November 14, 2024, 11:09pm UTC](https://forums.realmacsoftware.com/t/rapidweaver-version-8/45279/1 "2024-11-14T23:09:19Z")

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All of a sudden all my stacks are not loading and I am being told to reinstall every stack? Mac 10.13, Version 8. “Stacks: Couldn’t obtain plugin principal class” Advice?

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**Author:** ![dan](https://dub1.discourse-cdn.com/flex005/user_avatar/forums.realmacsoftware.com/dan/32/28516_2.png) [@dan](https://forums.realmacsoftware.com/u/dan)\
**Post date:** [November 14, 2024, 11:14pm UTC](https://forums.realmacsoftware.com/t/rapidweaver-version-8/45279/2 "2024-11-14T23:14:29Z")

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Sounds like you’ve moved to an Apple Silicon based Mac… We have a support doc in the manual on how to fix this issue.

> **[How to fix "Couldn't obtain plugin principle class" | Classic Manual](https://docs.realmacsoftware.com/classic-docs/user-manual/troubleshooting/how-to-fix-couldnt-obtain-plugin-principle-class)**

Hope that helps!

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**Author:** ![DeLong](https://avatars.discourse-cdn.com/v4/letter/d/3d9bf3/32.png) [@DeLong](https://forums.realmacsoftware.com/u/DeLong)\
**Post date:** [November 14, 2024, 11:26pm UTC](https://forums.realmacsoftware.com/t/rapidweaver-version-8/45279/3 "2024-11-14T23:26:05Z")

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Unfortunately, we are still running quite a few mac’s with 10.13.6, i5’s. we have not upgraded anything on these computers and all of a sudden the plugin’s are not loading and when we try to reload the plugin’s we get the “Stacks: Couldn’t obtain plugin principal class” message. Also stacks 5.1.0 has to be reloaded again and is missing when we re-open Rapidweaver 8.9.4. Suggestions? Older Rapidweaver 7 still works fine.