Build Freezes

I am beginner and stumbled upon this grave problem with apparently no solution.

My Editor freezes whenever I build lighting or simply just build the level.
I tried and looked everywhere but found no solution. I also tried to add the lightmass component and building the level but it doesnt work! I have tried reinstalling the engine and Visual Studio. It didn’t work and the error is showing up in swarm agent.

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the swarm agent log says :

 20:31:46: [ERROR] Channel registration failed. Reason: No such host is known
    , Callstack:    at System.Net.Dns.GetAddrInfo(String name)
       at System.Net.Dns.InternalGetHostByName(String hostName, Boolean includeIPv6)
       at System.Net.Dns.GetHostEntry(String hostNameOrAddress)
       at System.Runtime.Remoting.Channels.CoreChannel.GetMachineName()
       at System.Runtime.Remoting.Channels.CoreChannel.GetMachineIp()
       at System.Runtime.Remoting.Channels.Tcp.TcpServerChannel.SetupMachineName()
       at System.Runtime.Remoting.Channels.Tcp.TcpServerChannel..ctor(Int32 port)
       at Agent.AgentApplication.Main(String[] args).

I run an asus laptop specs are:

Intel core i7,

16 GB ram,

Nvidia GeForce 960M,

Unreal Version 4.18,

Microsoft Visual Studio 2017 Community Edition.

HELP ME!!!

it is have be solve ??? cause i also having the same problem…