Light Build loop

Attempted to run a light build and all looked well for a while. Unfortunately, the light build never reached .01% reduced its processor and memory usage and chugged along as if all was well. I left 90 minute pass before checking the logs and then manually shutting down the swarm.

This is what I received from the Swarm log

7:06:19 PM: [Interface:TryOpenConnection] Local connection established
7:06:31 PM: [Job] Accepted Job EBAFBA1F-4EB528F2-E609D89D-3F19295D
7:07:57 PM: [Interface:EndJobSpecification] Error: Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index System.ArgumentOutOfRangeException: Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index
Server stack trace:
at System.ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument argument, ExceptionResource resource)
at Agent.AgentJob.EndJobSpecification()
at Agent.Agent.EndJobSpecification_1_0(Int32 ConnectionHandle, Hashtable InParameters, Hashtable& OutParameters)
at System.Runtime.Remoting.Messaging.StackBuilderSink._PrivateProcessMessage(IntPtr md, Object[] args, Object server, Object[]& outArgs)
at System.Runtime.Remoting.Messaging.StackBuilderSink.SyncProcessMessage(IMessage msg)
Exception rethrown at [0]:
at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)
at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)
at NSwarm.IAgentInterfaceWrapper.EndJobSpecificationDelegate.EndInvoke(Hashtable& OutParameters, IAsyncResult result)
at NSwarm.IAgentInterfaceWrapper.EndJobSpecification(Int32 ConnectionHandle)
at NSwarm.FSwarmInterface.EndJobSpecification()

Can anyone direct me to a precise way to clear up this issue?

Thanks in advance

My rig
i5- 4960
32GB memory
2 - 2T (2.8 free) SATA drives
nVidia Geforce GTX 1060 6GB

is there a variable called “index” that seems to be causing this problem

As far as I know, there is no variable called “index”. I had assumed it had something more to do with the Swarm since the Light Build pulls a ton of data (indexes it) to to its thing.

I was meet this problen when i try build light in my project.
Reason of this problem - some textur \ mesh of plait tool - after removing this plaint unit from landscape problem was fixed!