A scripted object has a different serialization layout when loading errors in build

Unity Engine
1

When I build my Windows game I get a lot of the following errors:
The referenced script (Unknown) on this Behaviour is missing!

A scripted object (probably Animations.AnimationSequence?) has a different serialization layout when loading. (Read 44 bytes but expected 296 bytes)
Did you #ifdef UNITY_EDITOR a section of your serialized properties in any of your scripts?```

However, I have no idea where they come from, as I have no similar errors in the editor. I get the errors both when I #ifdef #endif my Editor code and when I don't, and I've run a script to check for "ghost" GameObject as described in [this article](https://gigadrillgames.com/2020/03/19/finding-missing-scripts-in-unity/) but it didn't find any. I've double checked that my Test Assemblies' Platform is set to Editor only.

As part of finding the issue, I made an empty scene and made a build with it. No errors.
I added a Mover script and ran a build. Got a bunch of errors.
Then I removed all the code from the Mover script and ran the build. No errors.
After slowly re-adding stuff to the Mover script, I found out that I only get these errors when I have *public* or *[SerializeField] private* variables in my script. *private* variables are fine.

I'm really scratching my head at this - why wouldn't it be okay to add those variables?
Here's the complete class with everything that causes an error commented out: https://hatebin.com/hliqdrrqvq 

Any help would be hugely appreciated!
2

None of these fields should cause that particular error.
But this script references other scripts like CharacterMover which may be where the issue is originating.

As the message says: find any instances of scripts where you #if away any serialized fields (public or SerializeField). And particularly look at those used by Animations.AnimationSequence.

Also try making a clean build.

3

hi BluezamX,

did you find a solution to your problem ?

4

Hi all - so having just spent a whole day working through the same error, it seems there are various causes. For me, the fix was not related to #if UNITY_EDITOR nor did it turn out to be related to the specific files mentioned in the error msg we are all seeing.

I am using .asmdef assembly references. It turned out a few of them had reference to Unity’s “testrunner” files (which I don’t remember even adding!) What worked for me is:

  1. Removing the references to anything to do with unity Testrunner (there were 2 such ref’s in my asmdefs)
  2. Scroll down the .asmdef window, and near bottom there is a box for “Define Constraints” and even after I completed #1, the box still had UNITY_INCLUDE_TESTS. Delete that.

After doing this to every one of my .asmdefs, it finally built. What a nightmare - I hope this helps someone someday!