Search in
Sort by:

Question Status:

Search help

  • Simple searches use one or more words. Separate the words with spaces (cat dog) to search cat,dog or both. Separate the words with plus signs (cat +dog) to search for items that may contain cat but must contain dog.
  • You can further refine your search on the search results page, where you can search by keywords, author, topic. These can be combined with each other. Examples
    • cat dog --matches anything with cat,dog or both
    • cat +dog --searches for cat +dog where dog is a mandatory term
    • cat -dog -- searches for cat excluding any result containing dog
    • [cats] —will restrict your search to results with topic named "cats"
    • [cats] [dogs] —will restrict your search to results with both topics, "cats", and "dogs"

UnrealLightmass stops unexpectedly


I have a map in which I'm trying to build lighting, however UnrealLightmass stops unexpectedly without any reason (and with any quality). This is the first time it ever happen in my case.

SwarmAgent log:

21:38:44: LogWindows: Warning: CreateProc failed (2) ../../../Engine/Binaries/Win64/CrashReportClient.exe "D:/...../AppData/Local/UnrealEngine/4.17/Saved/Swarm/Engine/Programs/UnrealLightmass/Saved/Crashes/_0000" -AppName=UE4-UnrealLightmass -CrashGUID=_0000 -DebugSymbols=......\Engine\Intermediate\Symbols

21:38:44: [Job] Job has failed! Job executable didn't exit cleanly. Exit code: 1

According to the generated minidump :

Exception Code : 0xC0000005

Exception Information: The thread tried to read from or write to a virtual address for which it does not have the appropriate access.

To avoid issues with privacy I would like to send my crash dump privately to an UE support guy or developer in case it would help.

Product Version: UE 4.17
more ▼

asked Aug 20 '17 at 07:48 PM in Using UE4

avatar image

25 2 9 11

(comments are locked)
10|2000 characters needed characters left
Viewable by all users

1 answer: sort voted first


I debugged a lightmass crash in 4.16 last night which could cause the logs you have entered. In our case the data in the Swarm Cache was stale caused the LOD data to be very incorrect. Cleaning out the SwarmCache folder fixes the issue as a work around. I'm not sure how we managed to get our cached data into that state but this could alleviate the crashes you experience



more ▼

answered Aug 25 '17 at 06:01 PM

avatar image

46 2 1

(comments are locked)
10|2000 characters needed characters left
Viewable by all users
Your answer
toggle preview:

Up to 5 attachments (including images) can be used with a maximum of 5.2 MB each and 5.2 MB total.

Follow this question

Once you sign in you will be able to subscribe for any updates here

Answers to this question