EnsureRunningOnMainThread can only be called from the main thread.

Hi!

When I build my game with DX12, it works but crashes once I try to launch the game.

Now I tried to build it with AutoGraphic API, but I get this error message and the build can't complete:

« EnsureRunningOnMainThread can only be called from the main thread.
Constructors and field initializers will be executed from the loading thread when loading a scene.
Don't use this function in the constructor or field initializers, instead move initialization code to the Awake or Start function. »

There is no way to catch there this comes from, help? At this rate maybe I'll be able to play a build in a month

 

Do you have a call stack for the EnsureRunningOnMainThread error?

 

From what I remember I don't think so since I'd have shared it... But now that I try it again in b14, it obviously works. I do get a crash in-game, but it's another issue.

 

Hi,
I'm receiving this error when building for iOS, restarting Unity solve the problem.

Code (JavaScript):

1. EnsureRunningOnMainThread is not allowed to be called during serialization, call it from Awake or Start instead. Called from MonoBehaviour 'Garage' on game object '5 Garage'.
2. See "Script Serialization" page in the Unity Manual for further details.
3. UnityEngine.Object:op_Inequality(Object, Object)
4. UnityEditorInternal.AnimationWindowSelectionItem:get_animationPlayer() (at /Users/builduser/buildslave/unity/build/Editor/Mono/Animation/AnimationWindow/AnimationWindowSelectionItem.cs:45)
5. UnityEditorInternal.StandaloneSelectionItem:get_animationClip() (at /Users/builduser/buildslave/unity/build/Editor/Mono/Animation/AnimationWindow/StandaloneSelectionItem.cs:24)
6. UnityEditorInternal.<CurveWasModified>c__AnonStorey49:<>m__8C(AnimationWindowSelectionItem) (at /Users/builduser/buildslave/unity/build/Editor/Mono/Animation/AnimationWindow/AnimationWindowState.cs:339)
7. System.Collections.Generic.List`1:Exists(Predicate`1)
8. UnityEditorInternal.AnimationWindowSelection:Exists(Predicate`1) (at /Users/builduser/buildslave/unity/build/Editor/Mono/Animation/AnimationWindow/AnimationWindowSelection.cs:199)
9. UnityEditorInternal.AnimationWindowState:CurveWasModified(AnimationClip, EditorCurveBinding, CurveModifiedType) (at /Users/builduser/buildslave/unity/build/Editor/Mono/Animation/AnimationWindow/AnimationWindowState.cs:339)
10. UnityEditor.HostView:OnGUI()
11.  

 

Hi, could you file a bug with a repro project and post the case number here?

 

Here it's: Case 792341
Let me know if you need something else.

 

Getting this too, from a script that has [ExecuteInEdit] mode on it. Tried commenting that out, and commenting out the entire class, and it still throws this error and will not build

Rebooted, and now it refuses to build saying the openvr_api.dll already exists... le sigh...

 

I also had this problem. The work around for me is to close the Animation tab when I'm building.

 

Thanks! For me it solved too.

 

Ah yes, closing the Animation tab. Pretty straight forward and obvious when you think about it really.

 

I'm getting this error too when loading a project with MapMagic 1.2 on Unity 5.4.0b17.

Here is the call stack:

UnityException: EnsureRunningOnMainThread is not allowed to be called during serialization, call it from Awake or Start instead. Called from MonoBehaviour 'MapMagic' on game object 'Map Magic'.
See "Script Serialization" page in the Unity Manual for further details.
UnityEngine.Object.GetInstanceID () (at C:/buildslave/unity/build/Runtime/Export/UnityEngineObject.cs:31)
MapMagic.Serializer+SerializedObject.GetValue (System.Type type, System.String name, MapMagic.Serializer ser) (at Assets/MapMagic/Main/Serializer.cs:114)
MapMagic.Serializer.Retrieve (Int32 num) (at Assets/MapMagic/Main/Serializer.cs:263)
MapMagic.Serializer+SerializedObject.GetValue (System.Type type, System.String name, MapMagic.Serializer ser) (at Assets/MapMagic/Main/Serializer.cs:121)
MapMagic.Serializer.Retrieve (Int32 num) (at Assets/MapMagic/Main/Serializer.cs:263)
MapMagic.Serializer+SerializedObject.GetValue (System.Type type, System.String name, MapMagic.Serializer ser) (at Assets/MapMagic/Main/Serializer.cs:121)
MapMagic.Serializer.Retrieve (Int32 num) (at Assets/MapMagic/Main/Serializer.cs:263)
MapMagic.Serializer+SerializedObject.GetValues (System.Type elementType, MapMagic.Serializer ser) (at Assets/MapMagic/Main/Serializer.cs:140)
MapMagic.Serializer.Retrieve (Int32 num) (at Assets/MapMagic/Main/Serializer.cs:245)
MapMagic.Serializer+SerializedObject.GetValue (System.Type type, System.String name, MapMagic.Serializer ser) (at Assets/MapMagic/Main/Serializer.cs:121)
MapMagic.Serializer.Retrieve (Int32 num) (at Assets/MapMagic/Main/Serializer.cs:263)
MapMagic.MapMagic.OnAfterDeserialize () (at Assets/MapMagic/MapMagic.cs:779)

 

Also received this error, running Unity 5.4.0b17. Stack:

EnsureRunningOnMainThread is not allowed to be called during serialization, call it from Awake or Start instead. Called from MonoBehaviour 'FishingVillage' on game object 'room_FishingVillage'.
See "Script Serialization" page in the Unity Manual for further details.
UnityEngine.Objectp_Inequality(Object, Object)
UnityEditorInternal.AnimationWindowSelectionItem:get_animationPlayer() (at /Users/builduser/buildslave/unity/build/Editor/Mono/Animation/AnimationWindow/AnimationWindowSelectionItem.cs:45)
UnityEditorInternal.StandaloneSelectionItem:get_animationClip() (at /Users/builduser/buildslave/unity/build/Editor/Mono/Animation/AnimationWindow/StandaloneSelectionItem.cs:24)
UnityEditorInternal.<CurveWasModified>c__AnonStorey4A:<>m__8D(AnimationWindowSelectionItem) (at /Users/builduser/buildslave/unity/build/Editor/Mono/Animation/AnimationWindow/AnimationWindowState.cs:339)
System.Collections.Generic.List`1:Exists(Predicate`1)
UnityEditorInternal.AnimationWindowSelection:Exists(Predicate`1) (at /Users/builduser/buildslave/unity/build/Editor/Mono/Animation/AnimationWindow/AnimationWindowSelection.cs:199)
UnityEditorInternal.AnimationWindowState:CurveWasModified(AnimationClip, EditorCurveBinding, CurveModifiedType) (at /Users/builduser/buildslave/unity/build/Editor/Mono/Animation/AnimationWindow/AnimationWindowState.cs:339)
UnityEditor.HostView:OnGUI()

As was the experience of others, closing the Animation tab allowed me to build.

 

Update. I moved the code inside MapMagic.MapMagic.OnAfterDeserialize () (at Assets/MapMagic/MapMagic.cs:779) to Awake(). And all has been well.

 

Im getting the same error :

UnityException: EnsureRunningOnMainThread can only be called from the main thread
UnityEngine.Object.GetInstanceID () (at C:/buildslave/unity/build/Runtime/Export/UnityEngineObject.cs:31)
UnityEngine.Object.IsNativeObjectAlive (UnityEngine.Object o) (at C:/buildslave/unity/build/Runtime/Export/UnityEngineObject.cs:126)
UnityEngine.Object.CompareBaseObjects (UnityEngine.Object lhs, UnityEngine.Object rhs) (at C:/buildslave/unity/build/Runtime/Export/UnityEngineObject.cs:90)
UnityEngine.Object.op_Inequality (UnityEngine.Object x, UnityEngine.Object y) (at C:/buildslave/unity/build/Runtime/Export/UnityEngineObject.cs:193)
BEngine.BTerrain.Biomes.Biome.hasSuplementaryTextureMap () (at Assets/Scripts/Engine/Terrain/Biomes/Biome.cs:343)
BEngine.BTerrain.Chunks.TerrainChunk.CreateTerrainData () (at Assets/Scripts/Engine/Terrain/Chunks/TerrainChunk.cs:152)
BEngine.BTerrain.Chunks.ChunkCache.CreateTerrainDataConsumer () (at Assets/Scripts/Engine/Terrain/Chunks/ChunkCache.cs:413)
UnityEngine.Debug:LogException(Exception)
BEngine.BTerrain.Chunks.ChunkCache:CreateTerrainDataConsumer() (at Assets/Scripts/Engine/Terrain/Chunks/ChunkCache.cs:420)

the function is :

Code (CSharp):

1. public bool hasSuplementaryTextureMap()
2.         {
3.             if (SuplementarySplatTexture != null && SuplementaryTextureType != SuplementaryType.None)
4.             {
5.                 if (SuplementaryTextureType == SuplementaryType.BlendNoise || SuplementaryTextureType == SuplementaryType.SwitchNoise)
6.                 {
7.                     if (SuplementaryNoise != null)
8.                     {
9.                         return true;
10.                     }
11.                     else
12.                     {
13.                         return false;
14.                     }
15.                 }
16.                 return true;
17.             }
18.             return false;
19.         }

Im just checking numm, and comparing enums.
I cant understand why this, Im on Unity 5.4.0b21 (64-bit), just testing my 5.3.4 project on 5.4.

Animator tab is closed.

 

Are you running this on a separate thread? This is triggered by comparing (== and != operator) UnityEngine.Object derived objects on another thread besides the main thread, which is not safe.

 

Yes Im running it on a separate thread, this is new of unity 5.4 this was not happening un 5.3, I found The problemas is when I check if a texture is null, I think its very problematic, I made a workaround, I can understand that check a Unity Object status outside The main thread can be problematic, but I think an error exception is too much, a warning would be enought, now I need to spent lot of time rewriting my conde without need (The texture is only declared at start its not changing un runtime) I think you are overreacting with this implementation.