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Fixed in 2020.1

Fixed in 2019.2, 2019.3



Found in


Issue ID




[iOS][OpenGLES2] Getting "Internal error, unrecognized message" when building



To reproduce:
1. Create a new project
2. Add a 3D Cube to a scene
3. Build for iOS
4. Observe errors in the console :
"Shader compiler: Compile Standard - FORWARD, Vertex Program: Internal error, unrecognized message from the shader compiler process. Please report a bug including this shader and the editor log."
5. Deploy the Xcode project to iOS device
6. Observe the crash at: "UnityGfxDeviceWorker (33): EXC_BAD_ACCESS (code=1, address=0x0"

Expected: the project is built without any issues
Actual: getting shader errors in the console while building the project and built project crashes on launch

Reproduced on:

Regression introduced in:

Not reproduced on:
2017.4.32f1 2018.4.10f1 2019.2.4f1 2019.3.0b4 2020.1.0a5

Crash reproduced on these devices:
- iPhone 7 iOS 12.3.1
- iPad Pro 12.9' (2nd gen) iOS 11.2.1

Getting only a black screen on these devices:
- iPad Mini 2 iOS 11.4.1
- iPad 5th gen iOS 10.3.3

- Attaching Editor.log for console errors
- Doesn't reproduce on Android VLNQA00015, Samsung Galaxy Note8 (SM-N950W), Android 8.0.0, CPU: Snapdragon 835 MSM8998, GPU: Adreno (TM) 540
- Reproduced on Metal, OpenGLES2
- Doesn't reproduce on OpenGLES3
- When building with OpenGLES2 getting a black screen with a grey SPHERE (sphere.png) even though there was only a CUBE in the scene
- When building for a second time, getting a pink screen in an iOS device

Comments (59)

  1. E4471575f97ed79dbf97c3f4b4a9adab?d=mm


    May 29, 2020 18:55

  2. 2e95ee477db5ba2fdc51f13b2cf39a1d?d=mm


    May 27, 2020 23:23

  3. 81af85f055524baad89f688ea03dca65?d=mm


    May 13, 2020 15:43

  4. 81af85f055524baad89f688ea03dca65?d=mm


    May 12, 2020 18:20

  5. 1e02a8459d319c8069ebd4bc1b78c88d?d=mm


    Dec 19, 2019 17:08

    Finally fixed on 2019.2.17!!!

  6. Cda329af758ec874a2398b9bba5be27c?d=mm


    Dec 19, 2019 03:22

    still happening in 2018.4.16f1

  7. C93165c9bb0bdc3ee0365c61710e2937?d=mm


    Dec 18, 2019 19:00

    As some already commented, disabling Multithreaded Rendering fixes this problem

  8. 85ed841620476f4d2bca16b43213d44f?d=mm


    Dec 17, 2019 09:25

    You can find temporary solution in this post.

    agmaster :
    Dear friends! This solution for Catalina OS works fine for me. Just replace UnityShaderCompiler file from 2019.3 beta to your 2019.2 (in my case 2019.2.9f1) Delete /Library folder and restart Unity

    check this comment out
    It works for me too
    Good luck

  9. 4c74fb3922bd6d9f9040621cdcc0999a?d=mm


    Dec 17, 2019 01:36

    Note: the problem seems to be only on Mac OS Catalina

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