Lighting Build Error

Hello,

I am experiencing a ‘Lighting Build’ issue and I’m not sure why it’s occurring. I also have never come across this error before.

The error itself is - MapCheck: Error: WorldSettings_1 Maps need lighting rebuilt

Swarm Log is - 12:52:43 AM: Starting up SwarmAgent …
12:52:43 AM: … registering SwarmAgent with remoting service
12:52:43 AM: … registering SwarmAgent network channels
12:52:43 AM: … initializing SwarmAgent
12:52:43 AM: … certificate check has failed
12:52:43 AM: … initializing cache
12:52:43 AM: … using cache folder ‘C:/Users/meers/AppData/Local/UnrealEngine/4.25/Saved/Swarm\SwarmCache’
12:52:43 AM: … recreating SwarmAgent cache staging area
12:52:43 AM: … initializing connection to SwarmCoordinator
12:52:43 AM: … using SwarmCoordinator on RENDER-01
12:52:43 AM: … SwarmCoordinator successfully initialized
12:52:43 AM: … initializing local performance monitoring subsystem
12:52:44 AM: … initialization successful, SwarmAgent now running
12:52:46 AM: [Interface:TryOpenConnection] Local connection established
12:57:49 AM: [Job] Accepted Job 6F467ECF-4E06E5F4-7E2159AF-2EAB98D8
1:12:23 AM: [Job] Launched Job UnrealLightmass_2020-12-18_16-05-38_1126144-64bit.exe
1:12:23 AM: [Job] PID is 30496
1:12:23 AM: [Job] GUID is “6F467ECF-4E06E5F4-7E2159AF-2EAB98D8”
1:12:24 AM: LogLightmass: Display: Lightmass Win64 started on: ALIENWARE-15-R4. Command-line: 6F467ECF4E06E5F47E2159AF2EAB98D8
1:12:24 AM: Failed to determine engine directory: Defaulting to …/…/…/Engine/
1:12:24 AM: Failed to load ‘aqProf.dll’ (GetLastError=126)
1:12:24 AM: File ‘aqProf.dll’ does not exist
1:12:24 AM: Failed to load ‘VtuneApi.dll’ (GetLastError=126)
1:12:24 AM: File ‘VtuneApi.dll’ does not exist
1:12:24 AM: Failed to load ‘VtuneApi32e.dll’ (GetLastError=126)
1:12:24 AM: File ‘VtuneApi32e.dll’ does not exist
1:12:24 AM: Lightmass Win64 started on: ALIENWARE-15-R4. Command-line: 6F467ECF4E06E5F47E2159AF2EAB98D8
1:12:24 AM: LogLightmass: Display: Processing scene GUID: 6F467ECF4E06E5F47E2159AF2EAB98D8 with 10 threads
1:12:24 AM: Processing scene GUID: 6F467ECF4E06E5F47E2159AF2EAB98D8 with 10 threads
1:12:24 AM: Building static lighting…
1:12:24 AM: [OpenConnection] Registering TCP channel …
1:12:24 AM: [OpenConnection] Connecting to agent …
1:12:24 AM: [TryOpenConnection] Testing the Agent
1:12:24 AM: [TryOpenConnection] Opening Connection to Agent
1:12:24 AM: [TryOpenConnection] Local Process ID is 30496
1:12:24 AM: [Job] Found a parent connection for PID 30496
1:12:24 AM: [Job] 50E54256 → 2582F3E6
1:12:24 AM: [Interface:TryOpenConnection] Local connection established
1:12:24 AM: [Interface:OpenChannel] Error: System.OverflowException: Array dimensions exceeded supported range.
at NSwarm.FSwarmInterface.OpenChannel(String ChannelName, EChannelFlags ChannelFlags)
1:12:24 AM: [Job] Job has failed! Job executable didn’t exit cleanly. Exit code: 2
1:12:24 AM: [CloseConnection] Closing connection 50E54256 using handle 50E54256
1:12:24 AM: [CloseConnection] Connection confirmed for disconnection 50E54256
1:12:24 AM: [CloseConnection] Closing orphaned Job (6F467ECF-4E06E5F4-7E2159AF-2EAB98D8)
1:12:24 AM: [MaintainConnections] Connection 50E54256 is DISCONNECTING
1:12:24 AM: [MaintainConnections] Detected dropped local connection, cleaning up (2582F3E6)
1:12:24 AM: [CloseConnection] Closing connection 2582F3E6 using handle 2582F3E6
1:12:24 AM: [CloseConnection] Connection confirmed for disconnection 2582F3E6
1:12:24 AM: [CloseConnection] Connection disconnected 2582F3E6
1:12:24 AM: [GetMessage] Safely returning to 2582F3E6 with no message
1:12:27 AM: [MaintainConnections] Connection 50E54256 is DISCONNECTING
1:12:27 AM: [MaintainConnections] Local connection has closed (2582F3E6)
1:12:27 AM: [MaintainConnections] Removed connection 2582F3E6
1:12:29 AM: [CloseConnection] Connection disconnected 50E54256
1:12:29 AM: [GetMessage] Safely returning to 50E54256 with no message
1:12:30 AM: [MaintainConnections] Local connection has closed (50E54256)
1:12:30 AM: [MaintainConnections] Removed connection 50E54256
1:12:30 AM: [MaintainConnections] All connections have closed

Can somebody please help me? I’m struggling to find a solution. I am using UE 4.25.4.

I have experienced it just now… I don’t know if you have solved the problem or not but I find that I have an object with stupidly high triangles above 8M for a single object. When I delete that object, the ligthing build run very smooth.