What It Means & How to Fix It

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🧠 Why You’re Seeing This Error

The C2511 error means you’re trying to override a virtual function, but the compiler either:

• Can’t find a matching function in the base class
• Or expects the override specifier, and you didn’t provide it (especially with UE5’s stricter coding standards or if your project uses -Werror)

In UE5, this often happens when:

• You override engine functions like Tick() or BeginPlay() but mess up the signature
• You forget to write override after the function
• The base class has a slightly different version (e.g., const, different param count)

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💥 Example Error Message

error C2511: 'void AMyActor::BeginPlay()' : overloaded member function not found in 'AMyActor'

Or, depending on your compiler settings:

warning C4263: 'void AMyActor::Tick(float)': member function does not override any base class methods

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🛠️ Example Code

// MyActor.h

UCLASS()
class AMyActor : public AActor
{
    GENERATED_BODY()

public:
    void Tick(); // ❌ Missing override, and wrong signature
};

// MyActor.cpp

void AMyActor::Tick()
{
    // Won't override AActor::Tick
}

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✅ How to Fix C2511 in UE5 – Step-by-Step

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✔️ 1. Match the Function Signature Exactly

Wrong:

void Tick(); // Missing float parameter

Fix:

virtual void Tick(float DeltaTime) override; // ✅ Exact match + override

Unreal’s base AActor class defines Tick(float DeltaSeconds) — if you change the parameter type, forget the parameter, or miss override, UE5 won’t recognize it.

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✔️ 2. Always Use the override Keyword

Even if it’s technically not required in plain C++, using override helps catch mismatches — and is often enforced in UE5 codebases.

Fix:

virtual void BeginPlay() override; // ✅ Safe and clear

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✔️ 3. Double-Check Base Class Definitions

If you’re overriding a custom virtual function from a base class, ensure:

• It really is virtual
• You’re not missing any const, &, or *
• You don’t change argument types (e.g., int vs int32)

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✔️ 4. Use IntelliSense or Ctrl+Click to Navigate to Base Function

Let your IDE show you the exact signature from the base class — copy it to avoid errors.

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✅ Summary: How to Fix C2511 in UE5

Cause	Fix Example
Missing override	Add override after method declaration
Wrong function signature	Match exactly what the base class defines
Overriding non-virtual function	Ensure base function is marked virtual
Typo in parameter list	Check types, constness, and argument count