Calling a function that doesn't exist on the target object

Why: You're calling '{fn}' on an object that doesn't have that function. The function may have been deleted, renamed, or moved to a different class. UE5 can't bind the call at compile time. Fix: Check the target pin's type. Search the Content Browser for the actual class name + look for '{fn}' in its functions. If found, drag a fresh reference and use the proper context menu Call Function path. If gone, find a replacement function or use an Interface call.

Event Dispatcher: create, bind, and call with custom data

SETUP: In your BP, create an Event Dispatcher (e.g. 'OnPlayerDied') in the My Blueprint panel. BIND (in another BP): Get reference to actor → Bind Event to OnPlayerDied → connect a Custom Event as the target. CALL (in owning BP): Call OnPlayerDied (appears as a pink node) → this broadcasts to all bound listeners. Key: Event Dispatchers are called with 'Call <DispatcherName>' (not 'Broadcast'). Binding is done via 'Bind Event to <DispatcherName>' which has an 'Event' exec-like pin.

DoOnce — execute only the first time, block subsequent calls

Macro. Call Reset input to allow re-triggering.

Server RPC — call a function on the server from a client

Create a Custom Event → check 'Replicates' in Details → set to 'Run On Server', 'Reliable'. Call from client → executes on server. Reliable = guaranteed delivery (use for important events). Unreliable = may drop (use for frequent updates like position).

Multicast RPC — call a function on server AND all clients

Custom Event → Replicates = 'Multicast'. When called on server, executes on server and all connected clients. Use for visual effects, sounds, animations that all players should see.

RPC

Remote Procedure Call — a function call sent across the network. Server / Client / Multicast versions exist.

Timer: call a function repeatedly using SetTimerByFunctionName

Pattern: EventBeginPlay → SetTimerByFunctionName(Object=self, FunctionName='OnTimerFired', Time=1.0, bLooping=true). Create a separate custom event/function named 'OnTimerFired' — this is what the timer will call. SetTimerByFunctionName inputs: 'Object' (Object, use 'self'), 'FunctionName' (string), 'Time' (float, interval in seconds), 'bLooping' (bool). Output: 'ReturnValue' (TimerHandle).

Client RPC — call a function on a specific client from the server

Custom Event → Replicates = 'Run On Owning Client'. Only executes on the client that owns this actor. Use for player-specific UI updates, messages, sounds.

PlaySoundAtLocation — play sound at world location

UGameplayStatics::PlaySoundAtLocation.

DoN — execute N times then stop