Hello there @B4ckto1obby!
The Conversion failed error could be triggered by many factors, if you can provide the log here, we can try to pinpoint the exact cause. In the meantime, there are general fixes for WP, tested across the community, that can be implemented here:
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Make sure your project has no active redirectors during convertion, simply right click on content browser and execute “Fix Up Redirectors”
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Confirm that you are only targeting the main level for conversion, not a sub-level
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If you were using “World Composition”, the feature could clash with WP, disable it before your next attempt
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As a test, migrate your main level to a clean project, and try converting it from there, to isolate the issue
Additionally, I suggest following’s UE’s extensive world building guide, for best practices on how to manage and control your level: