I am very new to this program…start using it only 2 Days ago . I got this error massege every time a try to open build . error code 0x00000e5 . What is this ?:(. Happens to anyone else here ? 
Hi Jensa.
I’m moving this out of the ‘Feedback’ section since it is not feedback regarding the engine.
As for the issue you are experiencing, please review this Swarm troubleshooting guide, specifically the section I link directly to - https://wiki.unrealengine.com/Swarm_Agent_Troubleshooting#Why_is_Swarm_Agent_not_launching.2C_or_What_does_.22UnrealLightmass.exe-Application_Error…22_mean.3F
That page mentions using Dependency Walker to identify the issue. There is a brief description of how to use Dependency Walker here (although this link is discussing troubleshooting a different issue) - http://help.epicgames.com/customer/portal/articles/2291317
Cheers