Map doesnt build lighting

Development Rendering
1

Hi,
for some reason, pressing the build button in the editor doesnt build lighting anymore. I’m using the source version of 4.14.1 and have tried the following:

  • Validating and rebuilding the engine
  • Applying various answerhub solutions for similar problems, such as deleting the AppData/Local/UnrealEngine folder and cleaning/validating the cache in the swarm agent.

It does also happen on fresh projects. This is log of SwarmAgent:

02:22:18: Starting up SwarmAgent ...
02:22:18:  ... registering SwarmAgent with remoting service
02:22:18:  ... registering SwarmAgent network channels
02:22:18:  ... initializing SwarmAgent
02:22:18:  ......... certificate check has failed
02:22:18:  ...... initializing cache
02:22:18:  ......... using cache folder 'C:/Program Files (x86)/Epic Games/Source4.14/Engine/Saved/Swarm\SwarmCache'
02:22:18:  ......... recreating SwarmAgent cache staging area
02:22:18:  ...... initializing connection to SwarmCoordinator
02:22:18:  ......... using SwarmCoordinator on RENDER-01
02:22:21:  ......... SwarmCoordinator failed to be initialized
02:22:21:  ...... initializing local performance monitoring subsystem
02:22:21:  ... initialization successful, SwarmAgent now running
02:22:21: [Interface:TryOpenConnection] Local connection established
02:22:21: [Interface:OpenJob] Error: Der Wert darf nicht NULL sein.
Parametername: value

‘Der Wert darf nicht NULL sein’ translates to ‘This value must not be NULL’

2

Might firewall be a culprit ?

3

try disabling any antivirus or windows firewall and try rebuilding

4

I didnt think it could be a firewall issue, but just now i tried again with disabled firewall and it worked! Then i tried again with firewall enabled and it worked again…

No clue why, but it works again, thanks for your hint!

5

no worries bro . Well now U know how to fix this issue . will find something useful about swarm here

6

Hrmm, i am having the same problem on a new version of an old project. I reset my firewall, turned it off and back on – and also updated the project to .14 from .13 , but the lighting still fails to build after you click accept on both types of network connections? Any suggestion?