Cant Build - Swarm Agent error

Development Rendering
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1

Worked on 4.6.1 before the upgrade to 4.7.x and no changes to the level.
It starts working after I get the actors under 300, other levels are 8k and up.

Cant build Lighting or all

10:45:01 AM: Starting up SwarmAgent …
10:45:01 AM: … registering SwarmAgent with remoting service
10:45:01 AM: … registering SwarmAgent network channels
10:45:01 AM: … initializing SwarmAgent
10:45:01 AM: … certificate check has failed
10:45:01 AM: … initializing cache
10:45:01 AM: … using cache folder ‘C:/SwarmCache’
10:45:01 AM: … recreating SwarmAgent cache staging area
10:45:01 AM: … initializing connection to SwarmCoordinator
10:45:01 AM: … using SwarmCoordinator on RENDER-01
10:45:01 AM: … SwarmCoordinator successfully initialized
10:45:01 AM: … initializing local performance monitoring subsystem
10:45:02 AM: … initialization successful, SwarmAgent now running
10:45:05 AM: [Interface:TryOpenConnection] Local connection established
10:45:05 AM: [Job] Accepted Job 410DCA68-4C4D5A16-479DC6BC-2CF86F2B
10:47:25 AM: [Interface:OpenChannel] Error: System.IO.IOException: The process cannot access the file ‘C:\SwarmCache\AgentStagingArea\A6640D7233BF47B4BBCF76BB4350A2B5.30CBE33D42C23B2E8CB6E49476EFD274.mtrlgz’ because it is being used by another process.
at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy, Boolean useLongPath, Boolean checkHost)
at System.IO.FileStream…ctor(String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, FileOptions options, String msgPath, Boolean bFromProxy)
at System.IO.FileStream…ctor(String path, FileMode mode, FileAccess access, FileShare share)
at NSwarm.FSwarmInterface.OpenChannel(String ChannelName, EChannelFlags ChannelFlags)

2

Hi docrst -

Try the following:

Check your \Unreal Engine*4.7*\Engine\Binaries\DotNET\ folder, Each Engine version has its own Swarm Agent, if you have an older version of the engine running Swarm Agent at start up you may be running two versions of the engine.

Go to your Swarm Cache folder (C:\SwarmCache) and delete all subfolders (Make sure that Swarm Agent / Coordinator and the Engine are not running when you do this.

Open Swarm Agent (not through the Editor) and Clean and Validate your Chache, insuring that the Cache Folder listed is correct.

Make sure that your drive where the Cache is located has a significant amount of free space in order to build lighting (on extremely large levels this could take upwards of 1GB+)

Try to Rebuild lighting in your project

Let me know -

Eric Ketchum