Swarm Failed To Kick Off - File In Use By Process

Dylan Browne
Thu, 05 Jun 2014 04:35:31 +0000
Rendering

Hello all, Have a slight problem since installing 4.2 this morning.
When I go to build lighting I get a message that Swarm has failed to kick off, checking my taskbar swarm is running and the log shows this message:

[1:46:09 PM] Dylan Browne: 1:45:45 PM: [Interface:OpenChannel] Error: System.IO.IOException: The process cannot access the file 'C:\Users\Dylza\AppData\Local\UnrealEngine\4.2\Saved\Swarm\SwarmCache\AgentStagingArea\A6630D7233BF47B3BBCF76BB4350A2B5.00000000000000000000000000000000.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)

Checked the file permissions which are all good, restarted my machine, removed the files in the AgentStagingArea folder, used process explorer to find out what is locking the file (according to that no process is locking it).
Any suggestions on what is going on here?
4.1 works fine aha.

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