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UE 4.15.0 Crash on Build Mac

Hello, I am using UE 4.15 on macOS 10.12.3 when I am tying to build my project it crashes on 60% - with the following Asserts

  Compiling optional shaders took 0.333
  seconds. Assertion failed:
  [Line: 446]  GBuffer required but not
  available. Failure often caused by
  incorrect custom code use in a post
  processing material.

The project was working perfectly today at 4.14.3. Same project builds compiles and works perfectly on a Windows machine with the 4.15.0!

Edit Considering the fact that the very same project works perfectly on a same Engine version on Windows platform I tend to think that it is some sort of a bug. I am not making anything platform specific + I am not making any custom post processing.

  • It would be helpful to know which exact material causing the crash - so I maybe can work it round.


Attaching Log files.

link text Please advice! Roma.

Crash Log:

  SEGV_MAPERR at 0x3
  int) Address = 0x100bc844b (filename
  not found) [in UE4Editor-Core.dylib]
  const*, ELogVerbosity::Type, FName
  const&) Address = 0x100d8d2d8
  (filename not found) [in
  FOutputDevice::Logf(wchar_t const*,
  ...) Address = 0x100e6f197 (filename
  not found) [in UE4Editor-Core.dylib]
  FDebug::AssertFailed(char const*, char
  const*, int, wchar_t const*, ...)
  Address = 0x100de8196 (filename not
  found) [in UE4Editor-Core.dylib]
  const Address = 0x110f82525 (filename
  not found) [in
  UE4Editor-Renderer.dylib] void
  FRHIPixelShader*, FSceneView const&,
  ESceneRenderTargetsMode::Type) const
  Address = 0x110f864b2 (filename not
  found) [in UE4Editor-Renderer.dylib]
  FRHIPixelShader*, FMaterialRenderProxy
  const*, FMaterial const&, FSceneView
  const&, TUniformBufferRef const&,
  bool, ESceneRenderTargetsMode::Type)
  Address = 0x11118dd98 (filename not
  found) [in UE4Editor-Renderer.dylib]
  FMaterialRenderProxy const*, FMaterial
  const&, FViewInfo const*, EBlendMode,
  bool, ESceneRenderTargetsMode::Type,
  bool, bool) Address = 0x110b69a6f
  (filename not found) [in
  FViewInfo const*,
  FDrawingPolicyRenderState const&,
  bool) const Address = 0x110b6868a
  (filename not found) [in
  UE4Editor-Renderer.dylib] void
  FProcessBasePassMeshParameters const&,
  FUniformLightMapPolicy const&,
  const&) Address = 0x1112b3541
  (filename not found) [in
  UE4Editor-Renderer.dylib] void
  FProcessBasePassMeshParameters const&,
  FDrawTranslucentMeshAction&&) Address
  = 0x111267e63 (filename not found) [in UE4Editor-Renderer.dylib]
  FViewInfo const&,
  FMeshBatch const&, unsigned long long
  const&, FDrawingPolicyRenderState
  const&, bool, FPrimitiveSceneProxy
  const*, FHitProxyId) Address =
  0x111266860 (filename not found) [in
  FViewInfo const&,
  FMeshBatch const&, bool,
  FDrawingPolicyRenderState const&,
  FPrimitiveSceneProxy const*,
  FHitProxyId) Address = 0x11126809a
  (filename not found) [in
  FSceneView const&, FMeshBatch const&,
  bool, FHitProxyId const&) Address =
  0x11106bd2b (filename not found) [in
  FSceneView const&,
  Address = 0x10f73f597 (filename not
  found) [in
  TRefCountPtr const&) Address =
  0x10f74679e (filename not found) [in
  const*) Address = 0x10f73ec76
  (filename not found) [in
  Address = 0x10383512f (filename not
  found) [in UE4Editor-Engine.dylib]
  UTextureRenderTarget2D*, TArray&)
  Address = 0x10f73554c (filename not
  found) [in
  Address = 0x10f7334d8 (filename not
  found) [in
  EViewModeIndex) Address = 0x108384585
  (filename not found) [in
  const&) Address = 0x1083831cc
  (filename not found) [in
  FName, TWeakPtr const&) Address =
  0x108381051 (filename not found) [in
  FName, bool) Address = 0x10837af12
  (filename not found) [in
  const Address = 0x11a6c2677 (filename
  not found) [in
  const Address = 0x106eda66d (filename
  not found) [in UE4Editor-Slate.dylib]
  Address = 0x10701ab9e (filename not
  found) [in UE4Editor-Slate.dylib]
  const Address = 0x10709cd31 (filename
  not found) [in UE4Editor-Slate.dylib]
  const&, FPointerEvent const&) Address
  = 0x1070f1f3a (filename not found) [in UE4Editor-Slate.dylib]
  FPointerEvent&) Address = 0x106eab06d
  (filename not found) [in
  Address = 0x106e4f1ae (filename not
  found) [in UE4Editor-Slate.dylib]
  FVector2D) Address = 0x106eb3b4a
  (filename not found) [in
  const&) Address = 0x100d23d8f
  (filename not found) [in
  Address = 0x100d21d3f (filename not
  found) [in UE4Editor-Core.dylib]
  Address = 0x106e78ab5 (filename not
  found) [in UE4Editor-Slate.dylib]
  FSlateApplication::Tick() Address =
  0x106e77fab (filename not found) [in
  FEngineLoop::Tick() Address =
  0x100ad65fc (filename not found) [in
  UE4Editor] GuardedMain(wchar_t const*)
  Address = 0x100adcba2 (filename not
  found) [in UE4Editor]
  -[UE4AppDelegate runGameThread:] Address = 0x100aea53c (filename not
  found) [in UE4Editor]
  -[FCocoaGameThread main] Address = 0x100d19366 (filename not found) [in
  UE4Editor-Core.dylib] Unknown()
  Address = 0x7fffa4e25c6d (filename not
  found) [in Foundation]
  _pthread_body Address = 0x7fffb8b6faab (filename not found) [in
  _pthread_body Address = 0x7fffb8b6f9f7 (filename not found) [in
  libsystem_pthread.dylib] thread_start
  Address = 0x7fffb8b6f1fd (filename not
  found) [in libsystem_pthread.dylib]

Product Version: UE 4.15
logs.zip (68.5 kB)
more ▼

asked Feb 17 '17 at 08:25 PM in Bug Reports

avatar image

537 6 19 23

avatar image Steve Hardister ♦♦ STAFF Feb 20 '17 at 10:27 PM

Have you tried opening the UE4.14.3 version on a Mac? If not, please try this. If so, what were your results?

avatar image ColdSteel48 Feb 20 '17 at 11:56 PM

Hello Steve,

I already converted the Project to 4.15 -> and I can't open it on 4.14.3 now :( (I saw it worked on Windows so decided to convert in place).

Before the conversion it was working (building) perfectly on Mac with 4.14.3 - that's why I think it is something internal inside UE4 :-?

I tried to change to SM4 and SM5 back and forth but the crash is the same.

However I have to say 1 more finding - I am not sure if it is helpful but I was able to package project (distribution configuration) successfully on Mac with the 4.15.0

I maybe forgot to mention as well - the build crashes on "Build texture streaming" phase - regardless if built only texture streaming or all together.

I also copied a "working" 4.15.0 project from Windows to Mac to ensure that the projects are same - but I get the same crash on build texture streaming.

I am using MBP late 2013 i7 2.3 quadcore with Nvidia GT 750m i

avatar image Steve Hardister ♦♦ STAFF Feb 22 '17 at 08:45 PM

I have reviewed your recent crashes against our records and have found that the reports from your machine are isolated to your project only. This typically means that there is something fixable in your project verses a bug that needs to be corrected in UE4 itself, though that's still a possibility.

That said, here are some things you can try (after making a back up of Project Folder):

  1. Delete your intermediate and Saved folders from your active Project Folder

  2. Right click on your Contents folder in the Content Browser and select "Fix up redirectors in folder"

  3. Run a map check for each level and correct any errors

  4. Save all

  5. Delete the DerivedDataCache folder from the Engine install directory

  6. Try to package again

Let me know if these steps do not resolve the issue. Also, next time you package, if it fails, provide the Output log as well as the Project log.

avatar image ColdSteel48 Feb 22 '17 at 11:32 PM

The package is actually succeed (That's why it is seems odd for me as well as the fact that it was working on 4.14.3 without any changes to the project since then - also same project works on Windows.)

It is a "build texture stream" that constantly crashing :-(. As for the steps above - I already tried them all and the Build still crashes.

If I could atleast to figure out what exact material (I suppose) causing the crash it would be much helpful.

avatar image Steve Hardister ♦♦ STAFF Feb 23 '17 at 02:56 PM

The project log and the output log should show this. Please post these.

avatar image ColdSteel48 Feb 23 '17 at 03:44 PM

I am sorry for my newbiness - but I am looking here https://wiki.unrealengine.com/Locating_Project_Logs

Could you please specify what exactly logs (or where is the locations) to post ?

avatar image ColdSteel48 Feb 23 '17 at 03:48 PM
avatar image ColdSteel48 Feb 23 '17 at 03:56 PM

Noticing that Last Material Named before the crash was BarbarianS I am posting it's blueprint here

I suppose it is one of the simplest materials ever :- )

barbariansbp.png (608.2 kB)
avatar image Steve Hardister ♦♦ STAFF Feb 23 '17 at 09:36 PM

I don't think that material is the culprit... It looks like it finished processing. Also, the error refers to a post process material:

 [2017.02.23-15.44.56:445][878]LogMac:Error: appError called: Assertion failed: Assertion failed: IsValidRef(GBufferResourcesUniformBuffer) [File:Runtime/Renderer/Private/PostProcess/SceneRenderTargets.h] [Line: 446] 
 GBuffer required but not available. Failure often caused by incorrect custom code use in a post processing material.

...So most likely, the Material Domain is going to be "Post Process" on the material causing the crash as shown here:


Enabling GBuffer options in your Project Settings>Rendering>Optimization>GBuffer may correct this issue. Otherwise you will need to locate the material and remove any custom code. The material should be a reflective material like glass or steel etc.

avatar image ColdSteel48 Feb 23 '17 at 09:55 PM

Thank you for your input sir, I will try both of your suggestions tomorrow and I will let you know.

Enabling G buffer has some negative performance effects ?

avatar image Steve Hardister ♦♦ STAFF Feb 23 '17 at 10:59 PM

The G Buffer is actually on by default. Increasing it to see if this would resolve the "GBuffer required but not available" was for troubleshooting but, yes, this would affect performance. That said, I think you should still narrow the search down to post process materials and check for blueprints within those materials that reference bad render targets.

avatar image ColdSteel48 Feb 24 '17 at 12:33 AM

Hi Steve, I found the material It was "SM_Water" from "Water Planes" project in Market Place... it was working in 4.14.3 though... as well as it works on Windows... I don't really want to give this asset up :(

Maybe something you can look in to it ?

Thanks, Roma.

avatar image ColdSteel48 Feb 24 '17 at 12:49 AM

I've re added the water to another test project, did all the same modifications See screen shot

And it works... Not sure how to deal with this problem now :(

avatar image Steve Hardister ♦♦ STAFF Feb 24 '17 at 09:13 PM

Some thoughts: Contact the creator to see if this is compatible with Macs in UE4.15.

You could also try migrating the material from the project where it works to replace the asset in the project where it is failing. (I recommend making a back up of the original Mac version of the Project Folder before replacing or renaming any assets.)

Same step above, but moving the asset to a new directory. If you do this, reapply the material from the new directory (instead of simply deleting and over-writing the old material. *Also, do not rename the material in case other files are referencing the material) Then right-click the Contents folder and select "Fix up redirectors in folder."

avatar image ColdSteel48 Feb 24 '17 at 10:04 PM

Hi Steve,

Thank you for your suggestions I will try them and let you know.

A little side note about the creator - it says it is some mysterious Epic Games ;-) and it written that it works on Win and Mac on 4.15.0 .

avatar image Steve Hardister ♦♦ STAFF Feb 24 '17 at 10:39 PM

I'll take a look at the Water_Planes asset on Monday (It's not technically "Market Place" which threw me ha ha) I see in the comments someone has written "Importing it in your Content folder is only half the battle. I find that texture references are all broken so nothing works." -This sounds similar to the issue you are experiencing.

avatar image ColdSteel48 Feb 24 '17 at 11:03 PM

Hey Steve, Apologize for misleading you. I am only 3-4 weeks on Unreal Engine - so I still have a lot of to learn starting from it's terminology etc... Thanks a lot for all your suggestions and help


avatar image rajibkumar Feb 26 '17 at 05:33 AM

It happened to me with 4.14.3 for windows version of project copied to mac. I did delete the build data registry from content/asset/map and build again in mac did work for me.

avatar image ColdSteel48 Feb 26 '17 at 03:40 PM

Hi rajibkumar, Thank you for your suggestion! But unfortunately it didn't solve my crash on Mac :(

avatar image rajibkumar Feb 28 '17 at 12:50 AM

I have been trying to build ios app. Worked mac but frustrated as it' hardware config is low, kept crashing. Now trying to work on windows and trying to remote compile on mac. DId you try with high config Mac, better graphics card?

avatar image ColdSteel48 Feb 28 '17 at 02:53 PM

HI rajibkumar ,

Unfortunately it is the only mac I have :(

avatar image ColdSteel48 Feb 27 '17 at 12:03 AM

Hi Steve, rajibkumar, I finally got rid of the crash - I found interesting things about Material blueprints as well.

I went on all the material and did some stuff (Scaled down texture - not sure if it affected my crash at all).

I think that the main part which did the trick (sadly I can't confirm because I changed a lot of stuff) was switching between "Surface ForwardShading" to Surface "TransluciencyVolume" previously I though that I must use forward shading for SSR apparently it works on a Translucent as well :).

Then I transferred it to mac and it built successfully, However I didn't see the water at all :-) Going in to the material editor: [SM5] You are using 17 texture samplers 16 is max... Opening the same just ported in Windows 15/16 :-)

Then I found the same texture was sampled 2 times in Mac was counted as 2 texture samples :(...

From what I have a feeling that Material Blueprints are lack of trivial Optimizations (Off trivial in terms well maintained compilers ;-) ) :-O is that so ?

So far so Good I have everything up and working for now.

But it would be great to know why Mac branch failed to build - so I can learn what not to do on it.

Best Week Guys! Roma.

avatar image ColdSteel48 Feb 27 '17 at 12:14 AM

Well not that fast :-(

After I wrote the last message I got my crash again without any changes...

But I surely was able to build it before I wrote the comment...

I think something is broken with this blueprint...

Same thing on Windows tells 15/16 texture samples and on Mac it says 16/16..

In Any case I failed to fix it :(

avatar image ColdSteel48 Mar 06 '17 at 06:25 PM

Hey Steve, it's being a week, I wonder if you had a look on it recently ?

avatar image Steve Hardister ♦♦ STAFF Mar 14 '17 at 05:57 PM

Sorry, for the delay but I finally had a chance to look at this and here are my results:

I was able to add the WaterPlanes Material to a blank project, apply to a large static mesh "plane" (stretched out box) and package if for distribution for Mac. This opened and worked as expected.

A couple thoughts, I added the 4.15 version to a 4.15 project rather than upgrading from a 4.14 project with this asset to 4.15. While this may work in Windows, Macs use different rendering methods that may not be compatible between versions. Hence, I recommend deleting your current WaterPlanes in your 4.15 project, then adding them back directly from the Launcher site.

Secondly, unless I missed it skimming back throught this post, I do not believe you have said what platform you are publishing to and specified what packaging settings you are using. In my test, I packaged for Mac, distribution, full rebuild, did not use Pak file or generate chunks.

Please try the troubleshooting steps above, in a blank project first, then in your project and let me know if the crash persists.

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Hi ColdSteel48,

Since we have not heard back from you in a while, we are marking this post "resolved" for tracking purposes. However, if you are still experiencing a crash with the Water Plane asset please respond with the requested information above and we will continue to investigate.

Note: you may want to try opening the the Water Plane asset in a blank UE4.15 project, see if that builds in a test package and, if so, migrate that assent to your current project replacing the current Water Plane asset.


Steve H.

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answered Mar 20 '17 at 01:58 PM

avatar image ColdSteel48 Mar 20 '17 at 03:23 PM

Hi Steve, I was not able to go over it yet, I am working on AI in present time and almost have no resources for a water plane.

I already tried opening it in a blank project and it worked fine.

Remigrating is a bit more complicated (Since I changed things and I want those things to remain) that means I will have to kill a lot of time remaking it to be the same.

I suppose it is fine to mark it as resolved. Thanks you for the help :-) B.R. Roma.

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