What It Means & How to Fix It in UE5
🧠 Why You’re Seeing This Error
This error appears when you try to call a function or access a property that only applies to a SceneComponent, but you’re doing it from a Blueprint class that isn’t one — like an Actor, Widget, or ActorComponent.
In short:
You’re calling a SceneComponent function on an object that isn’t a SceneComponent.
💥 Example Error Message
This Blueprint (self) is not a SceneComponent, therefore TARGET must have a connection
🛠️ Common Blueprint Scenario
Call Function: SetWorldLocation
Target: (Self) ❌
But this Blueprint is based on Actor, not SceneComponent.
✅ How to Fix It in UE5 – Step-by-Step
✔️ 1. Make Sure You’re Calling the Function on the Correct Target
Functions like SetWorldLocation, AttachToComponent, etc., only apply to SceneComponents.
Fix:
Get (MyMesh) → SetWorldLocation
Not:
Self → SetWorldLocation ❌
✔️ 2. Use a Valid SceneComponent as the Target
Any of the following would be valid:
- StaticMeshComponent
- SkeletalMeshComponent
- CollisionComponent
- Custom SceneComponent variables
✔️ 3. If You’re Trying to Move the Actor, Use Actor Functions Instead
Use:
SetActorLocation
Instead of:
SetWorldLocation (which only works on components)
🧱 What Does “TRASHCLASS” Mean?
If you’re also seeing a node or variable labeled TRASHCLASS, it means:
- The class it used to point to no longer exists
- It was deleted, renamed, or failed to compile
- The Blueprint is holding on to a broken reference
✔️ To Fix TRASHCLASS
- Delete any nodes or variables that say TRASHCLASS
- Recreate them manually using valid references or class types
- Recompile the Blueprint
✅ Summary: How to Fix “This Blueprint Is Not a SceneComponent, Therefore TARGET Must Have a Connection”
| Cause | Fix |
|---|---|
| Calling component function on self | Use a SceneComponent reference instead of self |
| Blueprint class isn’t a component | Replace node or switch to Actor-level equivalent function |
| TRASHCLASS showing in Blueprint | Delete the node and replace with valid class or reference |
