Why You’re Seeing This Error
This error looks confusing because both sides of the message appear identical, but behind the scenes, they are not the same type — even though the names match.
In UE5 Blueprints, this usually happens when:
- You try to connect two array pins that look the same but use slightly different class references under the hood
- One array is made from a child class, and the other expects an array of base classes
- You’re trying to assign or pass arrays between different Blueprint parent/child relationships or soft class references
💥 Example Error Message
Array of P Base Soft Class References is not compatible with Array of P Base Soft Class References
Yes — it literally says the same thing twice.
🛠️ Common Blueprint Scenario
Variable A: Array of [P_BaseClass Soft Class Reference]
Variable B: Array of [P_DerivedClass Soft Class Reference]
Set Variable A → Plug in Variable B
This throws an error, even though both appear to be the same “type” visually.
✅ How to Fix It in UE5 – Step-by-Step
✔️ 1. Convert Each Entry Individually Instead of Passing Whole Array
Use a For Each Loop to add each entry from one array to the other, casting or converting the type if needed.
For Each (Item in Variable B)
→ Add (Item) to Variable A
This bypasses the type mismatch.
✔️ 2. Double-Check the Actual Class Types in Both Arrays
Make sure both arrays are using:
[Same Class Reference Type]
e.g., both use "Soft Class Reference of P_Base" exactly
Sometimes one is referencing a parent and the other a subclass, which makes the array types incompatible.
✔️ 3. Recreate the Array Variable From Scratch (Last Resort)
Sometimes UE5 holds onto stale type metadata. Try:
- Delete the array variable
- Recreate it manually with the correct class reference
- Rewire the connection
This can clear hidden conflicts from old Blueprint references.
✅ Summary: How to Fix “Array of P Base Soft Class References Is Not Compatible” in UE5
| Cause | Fix |
|---|---|
| Type mismatch between soft class arrays | Loop through and add individually |
| One array uses a child class reference | Ensure both arrays use the exact same base class |
| Hidden stale metadata in Blueprint | Recreate the variable from scratch |
