Why: This asset was saved with UE {ver}, but you're opening it with a different version. Compile differences between versions can cause errors.

Fix: Best: open in the original UE {ver} version, do whatever migration is needed (Project menu → Convert In-Place), then re-open in your current version. If you don't have UE {ver}: open + save the asset, then re-compile. If errors persist, the underlying API may have changed between versions — check UE5 release notes for breaking changes.