Why You’re Seeing This Error
This error means the Blueprint is trying to call a function that doesn’t exist on the target object or class — in this case, it’s looking for IsHeadMountedDisplayEnabled on FirstPersonHUD, but that function either:
- Doesn’t exist in that Blueprint or class
- Was renamed, deleted, or moved to another class
- Was originally inherited but the parent has changed
- Is a C++ or engine function being called on the wrong type of object
💥 Example Error Message
Could not find a function named 'IsHeadMountedDisplayEnabled' in 'FirstPersonHUD'
🛠️ Common Blueprint Scenario
Get (FirstPersonHUD) → Call Function: IsHeadMountedDisplayEnabled
But FirstPersonHUD does not define or inherit this function — result: ❌ Compilation error.
✅ How to Fix It in UE5 – Step-by-Step
✔️ 1. Make Sure You’re Calling the Function on the Right Object
IsHeadMountedDisplayEnabled is part of the "HeadMountedDisplayFunctionLibrary"
It’s not a function that lives on HUD or PlayerController by default.
Fix:
Call Function: Is Head Mounted Display Enabled (from HeadMountedDisplayFunctionLibrary)
No need to call it from your HUD — it’s a global (static) function.
✔️ 2. Replace the Call with the Correct Node
Delete the bad call → Right-click → Search "Is Head Mounted Display Enabled"
→ Choose the node from the correct library
The correct version does not need a target pin — it’s a pure function.
✔️ 3. If You Intend to Add That Function to FirstPersonHUD, Define It
If you really want FirstPersonHUD to have that function:
- Open FirstPersonHUD
- Create a custom function called "IsHeadMountedDisplayEnabled"
- Add your desired logic or call the library function internally
✅ Summary: How to Fix “Could Not Find a Function Named ‘IsHeadMountedDisplayEnabled’” in UE5
| Cause | Fix |
|---|---|
| Calling function on the wrong object | Use the version from HeadMountedDisplayFunctionLibrary |
| Function was renamed or deleted | Recreate or reassign the correct function call |
| Intended to be local but isn’t | Define the function inside FirstPersonHUD manually if needed |
