Reference Exception on Example Scenes after merging Mars with current Project

Unity Engine
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1

Hey guys, this is great stuff, I’m looking to add Mars to my current ARFoundation project but it seems something has gone wrong with my current setup and I was hoping you could point me int he right direction.

When playing any of the example scenes in a fresh project, it works fine. When trying in my current project, I get these errors.

NullReferenceException: Object reference not set to an instance of an object
Unity.MARS.Data.IRequiresTraitsMethods.TryGetTraitValue[T] (Unity.MARS.Data.IRequiresTraits`1[T] obj, System.Int32 dataID, System.String traitName, T& value) (at Library/PackageCache/com.unity.mars@1.2.0/Interfaces/Traits/IRequiresTraits.cs:50)
Unity.MARS.Data.Reasoning.GeoDuplicationReasoningAPI.ProcessScene () (at Library/PackageCache/com.unity.mars@1.2.0/Runtime/Scripts/Reasoning APIs/GeoDuplicationReasoningAPI.cs:31)
Unity.MARS.Data.Reasoning.GeoDuplicationReasoningAPI.Setup () (at Library/PackageCache/com.unity.mars@1.2.0/Runtime/Scripts/Reasoning APIs/GeoDuplicationReasoningAPI.cs:24)
Unity.MARS.Data.Reasoning.ReasoningModule.SetupReasoningAPIs () (at Library/PackageCache/com.unity.mars@1.2.0/Runtime/Scripts/Modules/ReasoningModule.cs:167)
Unity.MARS.Data.Reasoning.ReasoningModule.Unity.XRTools.ModuleLoader.IModuleBehaviorCallbacks.OnBehaviorAwake () (at Library/PackageCache/com.unity.mars@1.2.0/Runtime/Scripts/Modules/ReasoningModule.cs:266)
Unity.XRTools.ModuleLoader.ModuleLoaderCore.OnBehaviorAwake () (at Library/PackageCache/com.unity.xrtools.module-loader@1.2.0/Runtime/Scripts/ModuleLoaderCore.cs:580)
UnityEngine.Debug:LogException(Exception)
Unity.XRTools.ModuleLoader.ModuleLoaderCore:OnBehaviorAwake() (at Library/PackageCache/com.unity.xrtools.module-loader@1.2.0/Runtime/Scripts/ModuleLoaderCore.cs:584)
Unity.MARS.MARSSession:Awake() (at Library/PackageCache/com.unity.mars@1.2.0/Runtime/Scripts/MARSSession.cs:128)

Unity Version 2019.4.18f1
ARFoundation Version: 4.1.3
ARKit 4.1.3
Mars: 1.2.0

Thanks, looking forward to adding this to our project.

2

Interesting; on a hunch, do you use GPS location (Input.location) in your AR Foundation project?

3

Nope! No location stuff.

4

Scratch that hunch then…
If you are able to can you file a bug using the bug reporter tool in the Editor? That will help us track this down.

5

Another hunch: Can you try deleting the Assets/MARS/Generated folder? This will trigger MARS to re-run code generation, which could fix the issue you are seeing. This may result in compile errors, so I recommend that you back up your project first.

6

I’m not seeing any folder named “Generated” inside the MARS folder. Hopefully this helps in some way. :slight_smile:

7

Done!

8

Can you please provide the ticket number or a link to the ticket? You should have gotten an e-mail after submission with this info.

9

Found the root of this: Another plugin in the project (ReorderableInspector) is stomping on a callback we rely on to trigger our code generation.
This has been fixed in their github repository but they haven’t made a release since then. You can either grab the latest version of their code or edit the one you have, changing Editor/ReorderableArrayInspector.cs:65 from

EditorApplication.delayCall = () => { EditorApplication.delayCall = () => { FORCE_INIT = false; }; };

to

EditorApplication.delayCall += () => { EditorApplication.delayCall = () => { FORCE_INIT = false; }; };
10

Awesome! Thank you!

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