Loading asset bundles: System.ArgumentNullException: Value cannot be null. (Parameter 'meth')

[MeblIkea]

What happened?

Hello! I'm trying to import an asset bundle into an IL2CPP game (built with Unity 2020.3.18 targeting Windows). Well I'm trying via RessourceStream (*note that the exact same error occurs with AssetBundle.LoadFromFile), and I have the following error.

namespace JarodMod;

[BepInPlugin(MyPluginInfo.PLUGIN_GUID, MyPluginInfo.PLUGIN_NAME, MyPluginInfo.PLUGIN_VERSION)]
public class Plugin : BasePlugin
{
    internal static new ManualLogSource Log;

    public override void Load()
    {
        // Plugin startup logic
        Log = base.Log;
        Log.LogInfo($"Plugin {MyPluginInfo.PLUGIN_GUID} is loaded UPDATED!");
        Harmony.CreateAndPatchAll(typeof(Plugin));

        // AssetBundle
        using var stream = Assembly.GetExecutingAssembly().GetManifestResourceStream("JarodMod.jarodbundle");
        var assetBundle = AssetBundle.LoadFromMemory(stream!.ReadBytes());

        Log.LogInfo("AssetBundle loaded successfully.");
    }
}

I've built the Asset Bundle using the same version as the game (mentioned above). I hope you'll be able to help me with this issue. Thanks!

BepInEx Distribution

Bleeding Edge from BepisBuilds

Log outputs

[Error  :   BepInEx] Error loading [Jarod 1.0.0]: System.ArgumentNullException: Value cannot be null. (Parameter 'meth')
   at System.Reflection.Emit.DynamicILGenerator.Emit(OpCode opcode, MethodInfo meth)
   at Il2CppInterop.Runtime.InteropTypes.Il2CppObjectBase.InitializerStore`1.Create() in /home/runner/work/Il2CppInterop/Il2CppInterop/Il2CppInterop.Runtime/InteropTypes/Il2CppObjectBase.cs:line 124
   at Il2CppInterop.Runtime.InteropTypes.Il2CppObjectBase.InitializerStore`1.get_Initializer() in /home/runner/work/Il2CppInterop/Il2CppInterop/Il2CppInterop.Runtime/InteropTypes/Il2CppObjectBase.cs:line 146
   at Il2CppInterop.Runtime.Runtime.Il2CppObjectPool.Get[T](IntPtr ptr) in /home/runner/work/Il2CppInterop/Il2CppInterop/Il2CppInterop.Runtime/Runtime/Il2CppObjectPool.cs:line 40
   at UnityEngine.AssetBundle.LoadFromMemory_Internal(Il2CppStructArray`1 binary, UInt32 crc)
   at UnityEngine.AssetBundle.LoadFromMemory(Il2CppStructArray`1 binary)
   at JarodMod.Plugin.Load() in E:\SteamLibrary\steamapps\common\Road 96\BepInEx\plugins\JarodMod\Plugin.cs:line 28
   at BepInEx.Unity.IL2CPP.IL2CPPChainloader.LoadPlugin(PluginInfo pluginInfo, Assembly pluginAssembly) in /home/runner/work/BepInEx/BepInEx/Runtimes/Unity/BepInEx.Unity.IL2CPP/IL2CPPChainloader.cs:line 134
   at BepInEx.Bootstrap.BaseChainloader`1.LoadPlugins(IList`1 plugins) in /home/runner/work/BepInEx/BepInEx/BepInEx.Core/Bootstrap/BaseChainloader.cs:line 411

Environment

- OS: Windows 10 22H2
- BepInEx: 6.0.0-be.697 (build commit `53625800b86f6c68751445248260edf0b27a71c2`)
- Game: Road 96

[MeblIkea]

Btw, tell me if you need more info, or if I can speed up the process in any way :D

[ds5678]

Sorry, your issue is outside my area of expertise; I was just labeling GitHub issues. I primarily focus on the generator portion of the codebase.

[MaxHoliday]

Was there ever a solution to this?

[MeblIkea]

Was there ever a solution to this?

In order to get Asset Bundles when you get this error, you can use this lib https://github.com/yukieiji/UniverseLib

[ds5678]

The issue should be resolved. I merged a pr 3 months ago which was supposed to fix this.

[MeblIkea]

The issue should be resolved. I merged a pr 3 months ago which was supposed to fix this.

I haven't really had the occasion to try it since. Let's say it works

[MeblIkea]

The issue should be resolved. I merged a pr 3 months ago which was supposed to fix this.

I updated to latest BIE Bleeding Edge, and still got the issue D:

I tried loading my Asset Bundle like that this time:

var dogBundle = AssetBundle.LoadFromFile(Path.Combine(Application.streamingAssetsPath, "dog"));
        
if (dogBundle == null)
{
      Debug.Log("Failed to load AssetBundle!");
      return;
}
var dogMat = (Material)dogBundle.Load<Material>("dog_mat");

Sorry for not testing before D:

[ds5678]

The issue should be resolved. I merged a pr 3 months ago which was supposed to fix this.

I updated to latest BIE Bleeding Edge, and still got the issue D:

Are you sure the BIE Bleeding Edge uses the latest Interop commit?

[MeblIkea]

No, but I'm not sure how to switch to latest Interop.

[ds5678]

I think the current version of MelonLoader uses an Interop build with the commit that fixed your issue.

Alternatively, you can build Bepinex from source and update the version before building.

[MaxtorCoder]

Can you not just update BepInEx to actually reflect these changes? It's kinda annoying having to build BepInEx and not being able to properly publish the plugin dll.

[ds5678]

Can you not just update BepInEx to actually reflect these changes?

I do not have the permissions required for this action.

[MaxtorCoder]

Can you not just update BepInEx to actually reflect these changes?

I do not have the permissions required for this action.

Guess I'll have to wait then until it's fixed for BepInEx, that is the only part that I am stuck on atm and I cannot use MelonLoader as I cannot use that DLL in Unity for custom component scripts.