What It Means & How to Fix It in UE5
🧠 Why You’re Seeing This Error
This error shows up when a function node has changed, but a pin connected to it hasn’t updated correctly. Usually, this happens when:
- The function’s input or output parameters were renamed or removed
- The function was recompiled or changed in its parent Blueprint
- A Blueprint interface function changed its signature
- A function in a child Blueprint was referencing an outdated version of the parent function
The <Unnamed> part just means the compiler doesn’t even know the pin’s name anymore — it’s completely broken.
💥 Example Error Message
In use pinno longer exists on node Call Public Func
🛠️ Common Blueprint Scenario
[Call Function: MyCustomFunction]
└── (Pin originally connected to "Damage Amount")
→ That pin was removed from the function
→ Node is now invalid and shows this error
✅ How to Fix It in UE5 – Step-by-Step
✔️ 1. Open the Function Being Called
- Double-click the "Call Public Func" node
- Open the original function definition (likely in the same Blueprint or a parent)
Check if any pins have:
- Been renamed
- Been removed
- Changed type
✔️ 2. Recreate the Call Node
- Delete the broken "Call Public Func" node
- Right-click and re-add the function call fresh
- Reconnect only the valid pins
This ensures the node refreshes with the latest signature.
✔️ 3. Recompile the Parent or Interface (if applicable)
If the function is:
- In a parent Blueprint → Open and compile the parent
- Part of an interface → Open the interface and recompile it
Then come back and recompile the child Blueprint.
✔️ 4. Reconnect or Rebuild Affected Pins
Sometimes the Blueprint system doesn’t auto-update pin names. Rebuild the function call and reconnect the pins manually.
✅ Summary: How to Fix “In Use Pin <Unnamed> No Longer Exists on Node Call Public Func” in UE5
| Cause | Fix |
|---|---|
| Function signature changed | Recreate the node and reconnect pins |
| Function was deleted or renamed | Rebuild logic using new function name |
| Interface or parent Blueprint updated | Recompile parent/interface and recompile the current Blueprint |
| Broken node reference after migration | Refresh the node and rewire pins manually |
