Custom Build Pipeline Error - Extra field Can not be serialized

Hello,

I have a custom build pipeline, which is triggered via script not the build window.

I have a class similar to this

Code (CSharp):

1. public class SomePlatformBehaviour : MonoBehaviour
2. {
3. #if USE_PLATFORM
4. public PlatformSpecificClass myvar;
5. //…. other code for "Platform"
6. #endif
7. }

In my Build Pipeline, before the build I enable the compiler Flag

USE_PLATFORM

, Then perform the build, so something like this:

Code (CSharp):

1.  
2. PlayerSettings.SetScriptingDefineSymbolsForGroup(group, "USE_PLATFORM");
3. AssetDatabase.Refresh();
4. result = BuildPipeline.BuildPlayer(ScenePaths, OutputPath, Target, MyOptions | BuildOptions.ShowBuiltPlayer ); //do the build

However I get the following error

SomePlatformBehaviour' has an extra field myvar of type 'PlatformSpecificClass' in the player and thus can't be serialized

I thought I resolved this error in the past by adding the

AssetDatabase.Refresh();

however evidentially it did not resolve this issue.

Does anybody have any ideas how I can resolve this issue?

Thanks in advance

 

You cannot change what data gets serialized in a class between platforms. Public variables are serialized by default, so you will either need to mark that variable as not serializable "[System.NonSerializable]" or make it available on all platforms.

If you must set a reference to an instance of the class using the inspector.. maybe you could instead use a public GameObject on all platforms, and use "gameObject.GetComponent<PlatformSpecificClass>()" at runtime on your specific platform.

Good luck!

 

Hi thank you for the reply.

unfortunately, this is a plug in to I can not simply mark the fields

[System.NonSerializable]

, or force the user to use

GetComponent

I would expect the above code to work the same way as

1. in the player settings, add

   USE_PLATFORM

   to the compiler defines
2. Make a build

This works without the error

 

If you set your serialization mode to "Text Only", you can open your scene file in notepad and see that components attached to GameObjects have a FileID. When you have a class that only exists on a specific platform, the FileID that belongs to that class represents unknown data on all other platforms. When you try to load a scene that has a component or a reference to a component that is excluded because of build flags, Unity will just see an unknown FileID and have no idea what component to load, or how important that component is.

That's because when you change your build platform manually, the scene, prefab, and asset files get updated to include new FileIDs that match the new platform. If you try to change the platform and build without re-saving the scenes and prefabs, any changes to FileIDs will cause the build to fail.

The error explains this: "'SomePlatformBehaviour' has an extra field myvar of type 'PlatformSpecificClass' in the player and thus can't be serialized". This is because it expects "SomePlatformBehavior" to serialize with FileIDs for one platform, but instead has data that matches FileIDs of a different platform.

Maybe there is some way for you to save the scene and update FileIDs via script after you set the build flags but before you build? I do not have experience with building via script.

 

Thank you for this information. The best solution to this is the latter suggestion of updating the fieldID and saving the project via script. I thought

AssetDatabase.Refresh() 

would do that but unfortunately not

 

Try

AssetDatabase.Refresh(ImportAssetOptions.ForceSynchronousImport)

?

 

Unfortunately, that does not work either.

I think there maybe a solution with the

AssemblyBuilder

and waiting for BuildFinished
(https://docs.unity3d.com/ScriptReference/Compilation.AssemblyBuilder.Build.html )

However have not tested this yet, I will try it out today