UE4 crashes when I save Landscape Mountains file

Maxxi · January 27, 2015, 6:28pm

I loaded the landscape Mountain scene in UE4 4.6.1 and I re-render the lightmap as it was specified.
I just changed the static lighting resolution to 3 for the landscape and the uvs for the trees. The rendering is fine, I got nice shadows but I crash every time I want to save the project.
Here is the log

MachineId:851DB3CD49D28B0488984B822B2606DC
EpicAccountId:

Unknown exception - code 00000001 (first/second chance not available)

Assertion failed: NewPosition >= 0 [File:D:\BuildFarm\buildmachine_++depot+UE4-Releases+4.6\Engine\Source\Runtime\Core\Private\Windows\WindowsPlatformFile.cpp] [Line: 59]

KERNELBASE + 37901 bytes
UE4Editor_Core + 3092349 bytes
UE4Editor_Core + 1597688 bytes
UE4Editor_Core + 1479058 bytes
UE4Editor_Core + 2981860 bytes
UE4Editor_Core + 773780 bytes
UE4Editor_Core + 2229609 bytes
UE4Editor_CoreUObject + 690620 bytes
UE4Editor_CoreUObject + 1541319 bytes
UE4Editor_UnrealEd + 1780841 bytes
UE4Editor_UnrealEd + 2625915 bytes
UE4Editor_UnrealEd + 2613112 bytes
UE4Editor_UnrealEd + 6316416 bytes
UE4Editor_UnrealEd + 3247874 bytes
UE4Editor_UnrealEd + 3243162 bytes
UE4Editor_UnrealEd + 3240820 bytes
UE4Editor_LevelEditor + 570935 bytes
UE4Editor_Slate + 588774 bytes
UE4Editor_Slate + 1535133 bytes
UE4Editor_Slate + 1030727 bytes
UE4Editor_Slate + 1037049 bytes
UE4Editor_Slate + 1435577 bytes
UE4Editor_Slate + 2116506 bytes
UE4Editor_Slate + 2296435 bytes
UE4Editor_Slate + 432060 bytes
UE4Editor_Slate + 160583 bytes
UE4Editor_Slate + 832224 bytes
UE4Editor_Slate + 770598 bytes
UE4Editor_Core + 2484713 bytes
UE4Editor_Core + 2400763 bytes
UE4Editor_Core + 2489275 bytes
UE4Editor_Core + 2387186 bytes
user32 + 105425 bytes
user32 + 104666 bytes
UE4Editor_Core + 2490486 bytes
UE4Editor!FEngineLoop::Tick() + 3434 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.6\engine\source\runtime\launch\private\launchengineloop.cpp:2193]
UE4Editor!GuardedMain() + 479 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.6\engine\source\runtime\launch\private\launch.cpp:131]
UE4Editor!GuardedMainWrapper() + 26 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.6\engine\source\runtime\launch\private\windows\launchwindows.cpp:126]
UE4Editor!WinMain() + 249 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.6\engine\source\runtime\launch\private\windows\launchwindows.cpp:202]
UE4Editor!__tmainCRTStartup() + 329 bytes [f:\dd\vctools\crt\crtw32\dllstuff\crtexe.c:618]

anonymous_user_b9532c9a · January 27, 2015, 7:54pm

Hi ,

This is the callstack, if you could, please go to the file location \Unreal Projects\PROJECT NAME\saved\logs\ and post the most recent crash log available. Additionally if you could post your dxdiag we’ll be more than happy to take a look and see what might be occurring. Thank you!

Maxxi · January 27, 2015, 9:23pm

Hi ,
Thanks for helping me,
Here are the files:

link text

anonymous_user_b9532c9a · January 28, 2015, 4:32pm

Do you get any crashes when you build/save the landscape mountains demo without changing any lighting resolution or does it only occur when you change the resolution to 3?

Maxxi · January 28, 2015, 4:45pm

Actually I was able to save the project with the resolution set to 2, but the shadows are too low resolution for the project I’m working on. So I decided to try 3 and it crashes every time I want to save. Maybe I should mention I had to change the location of the DerivedDataCache fodler, It was more than 30GB and I’ve got not space left on my drive C: So now this folder is on the same location as the project itself on drive D:

Maxxi · January 29, 2015, 11:06pm

Hi ,
Any news about this problem?
I was wondering if it could help to buy 16gb RAM (in total 32gb) in order to prevent the crash?

anonymous_user_b9532c9a · January 30, 2015, 3:42pm

Hi ,

I am still looking into this, I haven’t been able to reproduce it as of yet but it more than likely is a RAM issue. When I bump the resolution to 3 my build lighting runs at 100% memory and CPU (viewable in task manager). This pc build has 32 gigs of RAM and the processor is a 12 core. It is probably just too much for the system to handle.

Maxxi · January 30, 2015, 5:53pm

Thanks , I ordered 16GB RAM and will received it in 7 days. I will update you then.

anonymous_user_b9532c9a · February 10, 2015, 3:48pm

Hi ,

Have you seen any improvement in this error? Please let me know if you still need further assistance.

Maxxi · February 14, 2015, 2:57am

Hi ,

I added 16GB(32 in total), reformated my SSD, reinstall Windows 7 and unreal Engine, but I’m still crashing when I want to save the file. I tried with 4.6.1 and 4.7.0 preview 5. I don’t know what else to do to fix this problem?

anonymous_user_b9532c9a · February 16, 2015, 6:45pm

Try moving the entire project to the same location as the DerivedDataCache folder.

anonymous_user_b9532c9a · February 23, 2015, 8:26pm

Hi ,

We have not heard from you in several days. I am marking this thread as answered for tracking purposes. If you are still experiencing this crash, please comment with the requested information. Thank you.

Maxxi · February 23, 2015, 8:39pm

I added a comment 7 days but I can’t see it ! Unfortunately, I moved the entire project as suggested but I still have this crash when I save the project:(

anonymous_user_b9532c9a · March 3, 2015, 12:48am

Hi ,

I apologize it has taken me so long to get back to you. To say the least it has been a little bit hectic! I haven’t been able to reproduce this on my end but I am going to try one more time. It may just be a situation where the Landscape Mountains project has to be run at resolution 2 or less at this point.