Swarm Failed to build light

Hi I see different solution for this problem bug nothing warok on my project. Here the swarm log:
1-[Interface:OpenChannel] Error: System.IO.IOException: The process cannot access the file ‘C:\Users\admin\AppData\Local\UnrealEngine\4.4\Saved\Swarm\SwarmCache\AgentStagingArea\A6630D7233BF47B3BBCF76BB4350A2B5.F13EF9784E24C30723FBFAB21A9EABB3.mtrlgz’ because it is being used by another process.
2-at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
3-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)
4-at System.IO.FileStream…ctor(String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, FileOptions options, String msgPath, Boolean bFromProxy)
5-at System.IO.FileStream…ctor(String path, FileMode mode, FileAccess access, FileShare share)
6-at NSwarm.FSwarmInterface.OpenChannel(String ChannelName, EChannelFlags ChannelFlags)

The light building work fine before i create a main level where i stream other level. Building light work on the level I don’t stream. Help me plz. Thx you

Problem solved i don’t how but solved