Swarm Index out of range

Tried to build lighting on my level, it starts with export light data, it becomes 100%, then it stuck in this stage, after 5 minutes, nothing is builded and when I open swarm log, it show this

Error: System.ArgumentOutOfRangeException: Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: startIndex at System.ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument argument, ExceptionResource resource) at System.BitConverter.ToInt32(Byte[] value, Int32 startIndex) at NSwarm.FSwarmInterface.OpenChannel(String ChannelName, EChannelFlags ChannelFlags)

Found what was the problem, too dense foliage and many instanes, delete the foliage. works fine

Hi

Try my solution: