Fix: Project won't open after editing blueprint structures (Unreal Engine)
14How to fix your project after it crashing on open after editing blueprint structures.
Blueprint structures seem to be volatile in Unreal Engine. If edited, you need to refresh and recompile everywhere they're used, else the engine might not open tomorrow!
In this video I go through some of my experiences with this issue and some solutions for salvaging your data.
Not all hope is lost! Most of your work should be able to be restored!
For some more info, here is a Reddit post with my solution when I had this issue a few years ago: https://www.reddit.com/r/unrealengine/comments/18thajz/crash_on_startup_after_editing_blueprint_structure/
Here is also a good resource for doing your structures in C++ (I don't do this, but this could be good if you wanted to learn it and save the headache): https://www.developd.au/devblog-post/stay-away-from-blueprint-assets-for-enums-and-structures
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