Asset was saved with a different UE5 version

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.

Instance

A live, runtime object of a class. Properties on an instance can differ from defaults set in the class.

Less (float) — A < B

Two Blueprints reference each other in a way that can't compile

Why: '{a}' includes '{b}' as a hard reference, AND '{b}' includes '{a}' as a hard reference. UE5 can't compile either one first without the other already being compiled. Fix: Break the cycle by making ONE side use a SOFT reference (TSoftObjectPtr). Pick the side that doesn't need {b} immediately at construction — change the variable type to 'Soft Object Reference' instead of 'Object Reference'. Use Load Asset to resolve it at runtime.

Greater Equal (float) — A >= B

EqualEqual_FloatFloat — float equality comparison

Overlap

Two collision shapes occupying the same space without blocking. Use for triggers (volume, pickup).

NotEqual_FloatFloat — check if A not equal to B

Not_PreBool — logical NOT

OR Boolean — logical OR of two booleans