Need help fixing this playtest error

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All I’ve done recently is build the HLODs for this map of mine, and now I can’t upload it to playtest my game. It worked fine before, a bit laggy, but I was able to playtest my game before building the HLODs last night. The project size is 64%, was around 32% before building HLODs.
Anyone know what this error is about?

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I don’t quite know, but might be able to help troubleshoot.

could be possibly a deleted asset, but with references not cleared out of HLODs

Have you ever built HLODs on this map before ?
What is betterventures.zip, have you deleted content from this file ?