# Swarm Crashes - Can't restore old settings **URL:** \ **Category:** Getting Started & Setup\ **Tags:** swarm, build, unreal-engine, crash, bug-report, editor, question\ **Created:** [September 7, 2017, 9:59am UTC](https://forums.unrealengine.com/t/swarm-crashes-cant-restore-old-settings/403977 "2017-09-07T09:59:21Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![Jambax](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/jambax/32/904177_2.png) [@Jambax](https://forums.unrealengine.com/u/Jambax)\ **Post date:** [September 7, 2017, 9:59am UTC](https://forums.unrealengine.com/t/swarm-crashes-cant-restore-old-settings/403977/1 "2017-09-07T09:59:21Z")
I tried setting up distributed lighting builds for my system, and now I can’t build anything (even If I disable distribution). Here are my settings (both PC’s have identical settings and are connected via LAN). ![212629-settings.jpg](https://d3kjluh73b9h9o.cloudfront.net/original/4X/6/1/f/61fc4217fa6b93af5e8401c7f76f1bda6bd19bdd.jpeg) Unfortunately, whenever I try to build lighting from the editor - the editor dialog box pops up for about half a second then dissappears, and swarm doesn’t even start building lighting. I checked the log, and this is being printed everytime I run it: ``` [2017.09.07-09.54.03:925][342]LightingResults: New page: Lighting Build - 7 Sep 2017 11:54:03 [2017.09.07-09.54.03:932][342]LogSwarmInterface: [OpenConnection] Registering TCP channel ... [2017.09.07-09.54.03:933][342]LogSwarmInterface: [OpenConnection] Connecting to agent ... [2017.09.07-09.54.03:934][342]LogSwarmInterface: [TryOpenConnection] Testing the Agent [2017.09.07-09.54.03:935][342]LogSwarmInterface: [TryOpenConnection] Opening Connection to Agent [2017.09.07-09.54.03:935][342]LogSwarmInterface: [TryOpenConnection] Local Process ID is 6896 [2017.09.07-09.54.03:982][342]LogStaticLightingSystem: Running Lightmass w/ ImmediateImport mode ENABLED [2017.09.07-09.54.03:982][342]LogStaticLightingSystem: Running Lightmass w/ ImmediateProcess mode ENABLED [2017.09.07-09.54.03:982][342]LogStaticLightingSystem: Running Lightmass w/ Sorting mode ENABLED [2017.09.07-09.54.03:982][342]LogStaticLightingSystem: Running Lightmass w/ Mapping paddings ENABLED [2017.09.07-09.54.03:983][342]LogStaticLightingSystem: Running Lightmass w/ Mapping debug paddings DISABLED Exception thrown at 0x00007FFB6C439E08 (KernelBase.dll) in UE4Editor.exe: 0xE0434352 (parameters: 0xFFFFFFFF80004003, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x00007FFB43FB0000). The thread 0xc60 has exited with code 0 (0x0). [2017.09.07-09.54.04:045][342]LogEditorBuildUtils: Build time 0:00 ``` So clearly, something related to Swarm is crashing - but I have no indication what it is. I’ve followed all the setup guidelines for distributed builds, so why isn’t it working? Worst of all - I’ve reverted the settings, and now the Engine can’t start Lightmass at all. What’s the deal? I’m stuck an unable to build lighting on either machine now. I’m using a source-built version of the engine (4.17.1) - so I can’t use ‘Verify’ on the Launcher. ---
**Author:** ![Jambax](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/jambax/32/904177_2.png) [@Jambax](https://forums.unrealengine.com/u/Jambax)\ **Post date:** [September 7, 2017, 10:03am UTC](https://forums.unrealengine.com/t/swarm-crashes-cant-restore-old-settings/403977/2 "2017-09-07T10:03:36Z")
Just looked at the Swarm Log, this is what I get ``` 11:02:51: [Interface:TryOpenConnection] Local connection established 11:02:51: [Interface:OpenJob] Error: Value cannot be null. Parameter name: value 11:02:51: [MaintainConnections] Detected dropped local connection, cleaning up (643BF1C2) 11:02:51: [CloseConnection] Closing connection 643BF1C2 using handle 643BF1C2 11:02:51: [CloseConnection] Connection confirmed for disconnection 643BF1C2 11:02:51: [CloseConnection] Closing orphaned Job () 11:02:51: [CloseConnection] Connection disconnected 643BF1C2 11:02:51: [GetMessage] Safely returning to 643BF1C2 with no message 11:02:52: [MaintainConnections] Local connection has closed (643BF1C2) 11:02:52: [MaintainConnections] Removed connection 643BF1C2 11:02:52: [MaintainConnections] All connections have closed ``` ---
**Author:** ![Jambax](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/jambax/32/904177_2.png) [@Jambax](https://forums.unrealengine.com/u/Jambax)\ **Post date:** [September 7, 2017, 10:06am UTC](https://forums.unrealengine.com/t/swarm-crashes-cant-restore-old-settings/403977/3 "2017-09-07T10:06:03Z")
Tried disabling Windows Firewall on both machines. STILL fails. ---
**Author:** ![Jambax](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/jambax/32/904177_2.png) [@Jambax](https://forums.unrealengine.com/u/Jambax)\ **Post date:** [September 7, 2017, 10:16am UTC](https://forums.unrealengine.com/t/swarm-crashes-cant-restore-old-settings/403977/4 "2017-09-07T10:16:34Z")
I removed the Options.XML files so Swarm is back to default settings - now I get the same error, so I’m stuck an unable to build lighting at all. REALLY need a fix for this! ---
**Author:** ![Jambax](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/jambax/32/904177_2.png) [@Jambax](https://forums.unrealengine.com/u/Jambax)\ **Post date:** [November 4, 2017, 12:26pm UTC](https://forums.unrealengine.com/t/swarm-crashes-cant-restore-old-settings/403977/5 "2017-11-04T12:26:46Z")
BUMP. Still having this issue. Even reinstalled the engine. ---
**Author:** ![Jambax](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/jambax/32/904177_2.png) [@Jambax](https://forums.unrealengine.com/u/Jambax)\ **Post date:** [November 24, 2017, 9:02am UTC](https://forums.unrealengine.com/t/swarm-crashes-cant-restore-old-settings/403977/6 "2017-11-24T09:02:27Z")
I never managed to fix this - but I was able to get distributed builds working by following this guide. It seems to be the most up-to-date (even better than the documentation) [http://www.srombauts.fr/2017/11/10/ue4-use-swarm-distribute-lighting-build-network/](http://www.srombauts.fr/2017/11/10/ue4-use-swarm-distribute-lighting-build-network/) Since then I’ve upgraded engine versions, so sorry if anyone has the same issue in the future! ---
**Author:** ![zb1749](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@zb1749](https://forums.unrealengine.com/u/zb1749)\ **Post date:** [February 18, 2022, 10:04am UTC](https://forums.unrealengine.com/t/swarm-crashes-cant-restore-old-settings/403977/7 "2022-02-18T10:04:23Z")
HI, I try use Jenkins to build light , get some error msg . I just try debug swarm agent , got there are null exception at \UnrealSwarm\Agent\Connections.cs#GetProcessPathById So It should be Privilege Limited! see [windows - wmic process empty executablepath - Stack Overflow](https://stackoverflow.com/questions/63358876/wmic-process-empty-executablepath) At Last I run swarmagent as administor